diff --git a/packages/contracts/openapi.yaml b/packages/contracts/openapi.yaml
index 8157edf..eb77dca 100644
--- a/packages/contracts/openapi.yaml
+++ b/packages/contracts/openapi.yaml
@@ -74,6 +74,14 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/Error'
+        '429':
+          description: |
+            登录失败次数过多（AUTH_RATE_LIMITED，Task 13 契约修订）。
+            同账号+来源 IP 在窗口期内连续失败达到阈值后锁定一段时间。
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
         '500':
           $ref: '#/components/responses/InternalError'
 
@@ -967,6 +975,7 @@ components:
           enum:
             - AUTH_INVALID_CREDENTIALS
             - AUTH_TOKEN_EXPIRED
+            - AUTH_RATE_LIMITED
             - AUTH_FORBIDDEN
             - ALBUM_NOT_FOUND
             - ALBUM_NOT_PUBLIC
diff --git a/packages/contracts/src/errors.ts b/packages/contracts/src/errors.ts
index 06543a9..2a28d0e 100644
--- a/packages/contracts/src/errors.ts
+++ b/packages/contracts/src/errors.ts
@@ -2,6 +2,10 @@
 export const ErrorCodes = {
   AUTH_INVALID_CREDENTIALS: 'AUTH_INVALID_CREDENTIALS',
   AUTH_TOKEN_EXPIRED: 'AUTH_TOKEN_EXPIRED',
+  // Task 13 契约修订（已登记）：登录失败基础限速（总纲 P1）需要一个区别于
+  // 凭据错误的错误码——429 若复用 AUTH_INVALID_CREDENTIALS 会向客户端撒谎，
+  // 复用 VALIDATION_FAILED 则语义错位。与 openapi.yaml Error enum 同步增补。
+  AUTH_RATE_LIMITED: 'AUTH_RATE_LIMITED',
   AUTH_FORBIDDEN: 'AUTH_FORBIDDEN',
   ALBUM_NOT_FOUND: 'ALBUM_NOT_FOUND',
   ALBUM_NOT_PUBLIC: 'ALBUM_NOT_PUBLIC',
diff --git a/packages/contracts/src/generated/openapi.d.ts b/packages/contracts/src/generated/openapi.d.ts
index 3699948..5706aca 100644
--- a/packages/contracts/src/generated/openapi.d.ts
+++ b/packages/contracts/src/generated/openapi.d.ts
@@ -404,7 +404,7 @@ export interface components {
              * @description 稳定错误码，与 src/errors.ts 的 ErrorCodes 一一对应。
              * @enum {string}
              */
-            readonly code: "AUTH_INVALID_CREDENTIALS" | "AUTH_TOKEN_EXPIRED" | "AUTH_FORBIDDEN" | "ALBUM_NOT_FOUND" | "ALBUM_NOT_PUBLIC" | "ALBUM_UPLOAD_DISABLED" | "MEMBER_CONFLICT" | "UPLOAD_SESSION_CONFLICT" | "UPLOAD_VERIFY_FAILED" | "PHOTO_NOT_FOUND" | "PHOTO_NOT_PUBLIC" | "VALIDATION_FAILED" | "INTERNAL_ERROR";
+            readonly code: "AUTH_INVALID_CREDENTIALS" | "AUTH_TOKEN_EXPIRED" | "AUTH_RATE_LIMITED" | "AUTH_FORBIDDEN" | "ALBUM_NOT_FOUND" | "ALBUM_NOT_PUBLIC" | "ALBUM_UPLOAD_DISABLED" | "MEMBER_CONFLICT" | "UPLOAD_SESSION_CONFLICT" | "UPLOAD_VERIFY_FAILED" | "PHOTO_NOT_FOUND" | "PHOTO_NOT_PUBLIC" | "VALIDATION_FAILED" | "INTERNAL_ERROR";
             /** @description 服务器生成的可读消息（诊断用，不作为客户端展示文案依据）。 */
             readonly message: string;
             /** @description 请求追踪 ID。 */
@@ -957,6 +957,18 @@ export interface operations {
                     "application/json": components["schemas"]["Error"];
                 };
             };
+            /**
+             * @description 登录失败次数过多（AUTH_RATE_LIMITED，Task 13 契约修订）。
+             *     同账号+来源 IP 在窗口期内连续失败达到阈值后锁定一段时间。
+             */
+            429: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["Error"];
+                };
+            };
             500: components["responses"]["InternalError"];
         };
     };
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 91bc1c4..4dfebc4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -99,13 +99,13 @@ importers:
     dependencies:
       '@nestjs/common':
         specifier: ^10.4.6
-        version: 10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2)
+        version: 10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2)
       '@nestjs/core':
         specifier: ^10.4.6
-        version: 10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)
+        version: 10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)
       '@nestjs/platform-express':
         specifier: ^10.4.6
-        version: 10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)
+        version: 10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)
       '@node-rs/argon2':
         specifier: ^2.2.1
         version: 2.2.1
@@ -115,9 +115,15 @@ importers:
       '@photo/db-cn':
         specifier: workspace:*
         version: link:../../packages/db-cn
+      class-transformer:
+        specifier: ^0.5.1
+        version: 0.5.1
+      class-validator:
+        specifier: ^0.15.1
+        version: 0.15.1
       nestjs-pino:
         specifier: ^4.6.1
-        version: 4.6.1(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(pino-http@11.0.0)(pino@10.3.1)(rxjs@7.8.2)
+        version: 4.6.1(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(pino-http@11.0.0)(pino@10.3.1)(rxjs@7.8.2)
       pino:
         specifier: ^10.0.0
         version: 10.3.1
@@ -133,7 +139,7 @@ importers:
     devDependencies:
       '@nestjs/testing':
         specifier: ^10.4.6
-        version: 10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)(@nestjs/platform-express@10.4.22)
+        version: 10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)(@nestjs/platform-express@10.4.22)
       '@types/jest':
         specifier: ^29.5.13
         version: 29.5.14
@@ -1010,6 +1016,9 @@ packages:
   '@types/trusted-types@2.0.7':
     resolution: {integrity: sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==}
 
+  '@types/validator@13.15.10':
+    resolution: {integrity: sha512-T8L6i7wCuyoK8A/ZeLYt1+q0ty3Zb9+qbSSvrIVitzT3YjZqkTZ40IbRsPanlB4h1QB3JVL1SYCdR6ngtFYcuA==}
+
   '@types/yargs-parser@21.0.3':
     resolution: {integrity: sha512-I4q9QU9MQv4oEOz4tAHJtNz1cwuLxn2F3xcc2iV5WdqLPpUnj30aUuxt1mAxYTG+oe8CZMV/+6rU4S4gRDzqtQ==}
 
@@ -1299,6 +1308,12 @@ packages:
   cjs-module-lexer@1.4.3:
     resolution: {integrity: sha512-9z8TZaGM1pfswYeXrUpzPrkx8UnWYdhJclsiYMm6x/w5+nN+8Tf/LnAgfLGQCm59qAOxU8WwHEq2vNwF6i4j+Q==}
 
+  class-transformer@0.5.1:
+    resolution: {integrity: sha512-SQa1Ws6hUbfC98vKGxZH3KFY0Y1lm5Zm0SY8XX9zbK7FJCyVEac3ATW0RIpwzW+oOfmHE5PMPufDG9hCfoEOMw==}
+
+  class-validator@0.15.1:
+    resolution: {integrity: sha512-LqoS80HBBSCVhz/3KloUly0ovokxpdOLR++Al3J3+dHXWt9sTKlKd4eYtoxhxyUjoe5+UcIM+5k9MIxyBWnRTw==}
+
   classnames@2.5.1:
     resolution: {integrity: sha512-saHYOzhIQs6wy2sVxTM6bUDsQO4F50V9RQ22qBpEdCW+I+/Wmke2HOl6lS6dTpdxVhb88/I6+Hs+438c3lfUow==}
 
@@ -2141,6 +2156,9 @@ packages:
     resolution: {integrity: sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==}
     engines: {node: '>= 0.8.0'}
 
+  libphonenumber-js@1.13.13:
+    resolution: {integrity: sha512-hV6SmWnyQ8U1QXhhqbqYBHIStNnscG7A5XbGodgdHhf/8N5PwhYpJA5U/yHDjYwPYTd8uNGXqq416XctuvK2PA==}
+
   lines-and-columns@1.2.4:
     resolution: {integrity: sha512-7ylylesZQ/PV29jhEDl3Ufjo6ZX7gCqJr5F7PKrqc93v7fzSymt1BpwEU8nAUXs8qzzvqhbjhK5QZg6Mt/HkBg==}
 
@@ -3051,6 +3069,10 @@ packages:
     resolution: {integrity: sha512-kiGUalWN+rgBJ/1OHZsBtU4rXZOfj/7rKQxULKlIzwzQSvMJUUNgPwJEEh7gU6xEVxC0ahoOBvN2YI8GH6FNgA==}
     engines: {node: '>=10.12.0'}
 
+  validator@13.15.35:
+    resolution: {integrity: sha512-TQ5pAGhd5whStmqWvYF4OjQROlmv9SMFVt37qoCBdqRffuuklWYQlCNnEs2ZaIBD1kZRNnikiZOS1eqgkar0iw==}
+    engines: {node: '>= 0.10'}
+
   vary@1.1.2:
     resolution: {integrity: sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==}
     engines: {node: '>= 0.8'}
@@ -3798,7 +3820,7 @@ snapshots:
 
   '@lukeed/csprng@1.1.0': {}
 
-  '@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2)':
+  '@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2)':
     dependencies:
       file-type: 20.4.1
       iterare: 1.2.1
@@ -3806,12 +3828,15 @@ snapshots:
       rxjs: 7.8.2
       tslib: 2.8.1
       uid: 2.0.2
+    optionalDependencies:
+      class-transformer: 0.5.1
+      class-validator: 0.15.1
     transitivePeerDependencies:
       - supports-color
 
-  '@nestjs/core@10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)':
+  '@nestjs/core@10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)':
     dependencies:
-      '@nestjs/common': 10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      '@nestjs/common': 10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2)
       '@nuxtjs/opencollective': 0.3.2
       fast-safe-stringify: 2.1.1
       iterare: 1.2.1
@@ -3821,14 +3846,14 @@ snapshots:
       tslib: 2.8.1
       uid: 2.0.2
     optionalDependencies:
-      '@nestjs/platform-express': 10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)
+      '@nestjs/platform-express': 10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)
     transitivePeerDependencies:
       - encoding
 
-  '@nestjs/platform-express@10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)':
+  '@nestjs/platform-express@10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)':
     dependencies:
-      '@nestjs/common': 10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2)
-      '@nestjs/core': 10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      '@nestjs/common': 10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      '@nestjs/core': 10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)
       body-parser: 1.20.4
       cors: 2.8.5
       express: 4.22.1
@@ -3837,13 +3862,13 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  '@nestjs/testing@10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)(@nestjs/platform-express@10.4.22)':
+  '@nestjs/testing@10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)(@nestjs/platform-express@10.4.22)':
     dependencies:
-      '@nestjs/common': 10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2)
-      '@nestjs/core': 10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      '@nestjs/common': 10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      '@nestjs/core': 10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.22)(reflect-metadata@0.2.2)(rxjs@7.8.2)
       tslib: 2.8.1
     optionalDependencies:
-      '@nestjs/platform-express': 10.4.22(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)
+      '@nestjs/platform-express': 10.4.22(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/core@10.4.22)
 
   '@noble/hashes@1.8.0': {}
 
@@ -4261,6 +4286,8 @@ snapshots:
   '@types/trusted-types@2.0.7':
     optional: true
 
+  '@types/validator@13.15.10': {}
+
   '@types/yargs-parser@21.0.3': {}
 
   '@types/yargs@17.0.35':
@@ -4606,6 +4633,14 @@ snapshots:
 
   cjs-module-lexer@1.4.3: {}
 
+  class-transformer@0.5.1: {}
+
+  class-validator@0.15.1:
+    dependencies:
+      '@types/validator': 13.15.10
+      libphonenumber-js: 1.13.13
+      validator: 13.15.35
+
   classnames@2.5.1: {}
 
   cliui@7.0.4:
@@ -5618,6 +5653,8 @@ snapshots:
       prelude-ls: 1.2.1
       type-check: 0.4.0
 
+  libphonenumber-js@1.13.13: {}
+
   lines-and-columns@1.2.4: {}
 
   locate-path@5.0.0:
@@ -5739,9 +5776,9 @@ snapshots:
 
   neo-async@2.6.2: {}
 
-  nestjs-pino@4.6.1(@nestjs/common@10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2))(pino-http@11.0.0)(pino@10.3.1)(rxjs@7.8.2):
+  nestjs-pino@4.6.1(@nestjs/common@10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2))(pino-http@11.0.0)(pino@10.3.1)(rxjs@7.8.2):
     dependencies:
-      '@nestjs/common': 10.4.22(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      '@nestjs/common': 10.4.22(class-transformer@0.5.1)(class-validator@0.15.1)(reflect-metadata@0.2.2)(rxjs@7.8.2)
       pino: 10.3.1
       pino-http: 11.0.0
       rxjs: 7.8.2
@@ -6521,6 +6558,8 @@ snapshots:
       '@types/istanbul-lib-coverage': 2.0.6
       convert-source-map: 2.0.0
 
+  validator@13.15.35: {}
+
   vary@1.1.2: {}
 
   walker@1.0.8:
diff --git a/services/api/package.json b/services/api/package.json
index 79e0a7f..8a364e5 100644
--- a/services/api/package.json
+++ b/services/api/package.json
@@ -20,6 +20,8 @@
     "@node-rs/argon2": "^2.2.1",
     "@photo/contracts": "workspace:*",
     "@photo/db-cn": "workspace:*",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.15.1",
     "nestjs-pino": "^4.6.1",
     "pino": "^10.0.0",
     "pino-http": "^11.0.0",
diff --git a/services/api/src/app-cn.module.ts b/services/api/src/app-cn.module.ts
index 8fa372d..0710729 100644
--- a/services/api/src/app-cn.module.ts
+++ b/services/api/src/app-cn.module.ts
@@ -1,14 +1,22 @@
 // services/api/src/app-cn.module.ts
 // 根模块：Prisma（@Global，封装 @photo/db-cn）、日志（nestjs-pino / pino-http）、
-// request-id 中间件、全局异常过滤器、/v1/health。
-// 功能模块（auth/albums/uploads/photos/public）自 Task 12+ 起逐个加入。
-// 过滤器经 APP_FILTER、中间件经 NestModule 在模块层注册——e2e 直接 import 本模块
-// 即可获得与生产一致的管线（全局前缀除外，由入口设置）。
-import { type MiddlewareConsumer, Module, type NestModule } from '@nestjs/common';
-import { APP_FILTER } from '@nestjs/core';
+// request-id 中间件、全局异常过滤器、全局校验管道（Task 13 起，DTO 经
+// class-validator 声明、ValidationPipe 强制，失败由过滤器映射 400 VALIDATION_FAILED）、
+// /v1/health、/v1/auth/*（Task 13）。
+// 功能模块（albums/uploads/photos/public）自 Task 15+ 起逐个加入。
+// 过滤器/管道经 APP_FILTER/APP_PIPE、中间件经 NestModule 在模块层注册——e2e 直接
+// import 本模块即可获得与生产一致的管线（全局前缀除外，由入口设置）。
+import {
+  type MiddlewareConsumer,
+  Module,
+  type NestModule,
+  ValidationPipe,
+} from '@nestjs/common';
+import { APP_FILTER, APP_PIPE } from '@nestjs/core';
 import { LoggerModule } from 'nestjs-pino';
 import type { IncomingMessage, ServerResponse } from 'node:http';
 import { AllExceptionsFilter } from './all-exceptions.filter';
+import { AuthModule } from './auth/auth.module';
 import { HealthController } from './health.controller';
 import { PrismaModule } from './prisma/prisma.module';
 import { RequestIdMiddleware, resolveRequestId } from './request-id.middleware';
@@ -19,6 +27,7 @@ import type { ServerRequestWithId } from './shared/request-with-id';
   imports: [
     // @Global：功能模块（Task 12+）直接注入 PrismaService，无需 re-import。
     PrismaModule,
+    AuthModule,
     LoggerModule.forRoot({
       pinoHttp: {
         // 与 RequestIdMiddleware 共用同一解析函数：优先透传 x-request-id，
@@ -43,7 +52,16 @@ import type { ServerRequestWithId } from './shared/request-with-id';
     }),
   ],
   controllers: [HealthController],
-  providers: [{ provide: APP_FILTER, useClass: AllExceptionsFilter }],
+  providers: [
+    { provide: APP_FILTER, useClass: AllExceptionsFilter },
+    // 全局校验管道（Task 13）：whitelist 剥离 DTO 未声明的属性（契约未禁未知
+    // 字段，剥离而非拒绝）；校验失败抛 BadRequestException → 过滤器映射
+    // 400 VALIDATION_FAILED。经 APP_PIPE 在模块层注册，e2e 复用同一管线。
+    {
+      provide: APP_PIPE,
+      useFactory: () => new ValidationPipe({ whitelist: true }),
+    },
+  ],
 })
 export class AppCnModule implements NestModule {
   configure(consumer: MiddlewareConsumer): void {
diff --git a/services/api/src/auth/auth.controller.ts b/services/api/src/auth/auth.controller.ts
new file mode 100644
index 0000000..19d807f
--- /dev/null
+++ b/services/api/src/auth/auth.controller.ts
@@ -0,0 +1,70 @@
+// services/api/src/auth/auth.controller.ts —— /auth/* 端点（Task 13）。
+// 方法名与契约 operationId 一一对应（loginWithPassword / refreshSession / logout），
+// 响应形状严格契约：camelCase sessionToken/expiresAt，logout 204 无响应体。
+// /auth/password 无守卫（security: []）；refresh/logout 经 SessionGuard（Bearer）。
+import {
+  Body,
+  Controller,
+  HttpCode,
+  HttpStatus,
+  Post,
+  Req,
+  UseGuards,
+} from '@nestjs/common';
+import { ErrorCodes } from '@photo/contracts';
+import { ApiException } from '../api-exception';
+import { AuthService } from './auth.service';
+import { LoginRequestDto } from './dto';
+import { AuthenticatedRequest, SessionGuard } from './session.guard';
+
+/** 登录请求侧只需客户端来源 IP（限速键的一半）。 */
+interface ClientRequest {
+  ip?: string;
+  socket?: { remoteAddress?: string | undefined };
+}
+
+function clientIpOf(req: ClientRequest): string {
+  return req.ip ?? req.socket?.remoteAddress ?? 'unknown';
+}
+
+/** 守卫放行后提取会话 id；防御性兜底（守卫未挂载属装配错误，按未认证拒绝）。 */
+function sessionOf(req: AuthenticatedRequest): string {
+  if (req.sessionId === undefined || req.user === undefined) {
+    throw new ApiException(
+      ErrorCodes.AUTH_TOKEN_EXPIRED,
+      'Session token is missing, invalid, or expired',
+      HttpStatus.UNAUTHORIZED,
+    );
+  }
+  return req.sessionId;
+}
+
+@Controller('auth')
+export class AuthController {
+  constructor(private readonly authService: AuthService) {}
+
+  @Post('password')
+  @HttpCode(HttpStatus.OK)
+  loginWithPassword(
+    @Body() dto: LoginRequestDto,
+    @Req() req: ClientRequest,
+  ): Promise<{ sessionToken: string; expiresAt: string }> {
+    return this.authService.login(dto.account, dto.password, clientIpOf(req));
+  }
+
+  @Post('refresh')
+  @UseGuards(SessionGuard)
+  @HttpCode(HttpStatus.OK)
+  refreshSession(
+    @Req() req: AuthenticatedRequest,
+  ): Promise<{ expiresAt: string }> {
+    return this.authService.refresh(sessionOf(req));
+  }
+
+  @Post('logout')
+  @UseGuards(SessionGuard)
+  @HttpCode(HttpStatus.NO_CONTENT)
+  async logout(@Req() req: AuthenticatedRequest): Promise<void> {
+    await this.authService.logout(sessionOf(req));
+  }
+}
diff --git a/services/api/src/auth/auth.module.ts b/services/api/src/auth/auth.module.ts
new file mode 100644
index 0000000..1582dae
--- /dev/null
+++ b/services/api/src/auth/auth.module.ts
@@ -0,0 +1,15 @@
+// services/api/src/auth/auth.module.ts —— 认证模块（Task 13）。
+// SessionGuard 一并提供（@UseGuards(SessionGuard) 按类引用时经所属模块 DI 解析），
+// 但无需 export：guard 只依赖 @Global 的 PrismaService，任意功能模块引用均可解析。
+// export AuthService 供后续模块复用（如管理端主动吊销会话）。
+import { Module } from '@nestjs/common';
+import { AuthController } from './auth.controller';
+import { AuthService } from './auth.service';
+import { SessionGuard } from './session.guard';
+
+@Module({
+  controllers: [AuthController],
+  providers: [AuthService, SessionGuard],
+  exports: [AuthService],
+})
+export class AuthModule {}
diff --git a/services/api/src/auth/auth.service.ts b/services/api/src/auth/auth.service.ts
new file mode 100644
index 0000000..ff6cf2b
--- /dev/null
+++ b/services/api/src/auth/auth.service.ts
@@ -0,0 +1,209 @@
+// services/api/src/auth/auth.service.ts —— 登录 / 滑动续期 / 注销核心逻辑（Task 13）。
+// 会话模型：长效单令牌 + 滑动续期（用户决策 2026-09-17，不做 access/refresh 双层）。
+//   令牌 = 32B randomBytes hex（仅登录响应出现一次）；库内只存 sha256(token)。
+// 安全要点：
+//   · 防账号枚举——账号不存在 / 密码错误 / 状态不合格（停用、锁定、待激活）三者
+//     返回同一 401 AUTH_INVALID_CREDENTIALS 且同文案；账号不存在时也跑一次等代价
+//     argon2 verify（dummy hash）拉平时延，杜绝「响应快慢」侧信道。
+//   · 登录失败限速（总纲 P1）——account+IP 维度、15 分钟窗口、5 次失败锁定，
+//     成功登录清零。进程内存实现：P1a 单实例足够；P5 多实例需换 Redis 后端限速器
+//     （本类私有接口不变，替换实现即可）。
+//   · 审计——登录成功写 audit_logs(action='auth.login', actor=用户)；
+//     注销不写审计（会话行 revokedAt 本身即持久的注销凭据）。
+import { randomBytes } from 'node:crypto';
+import { HttpStatus, Injectable } from '@nestjs/common';
+import { ErrorCodes } from '@photo/contracts';
+import { ApiException } from '../api-exception';
+import { PrismaService } from '../prisma/prisma.service';
+import { hashPassword, verifyPassword } from './password';
+import { hashSessionToken } from './session.guard';
+
+/** 契约默认 30 天（.env AUTH_SESSION_TTL_SECONDS 同名可调）。 */
+const DEFAULT_SESSION_TTL_SECONDS = 2_592_000;
+
+const LOGIN_RATE_LIMIT_MAX_FAILURES = 5;
+const LOGIN_RATE_LIMIT_WINDOW_MS = 15 * 60 * 1000;
+
+function invalidCredentials(): ApiException {
+  return new ApiException(
+    ErrorCodes.AUTH_INVALID_CREDENTIALS,
+    'Invalid account or password',
+    HttpStatus.UNAUTHORIZED,
+  );
+}
+
+// 惰性生成一次 dummy argon2 哈希并复用：账号不存在路径用它跑等代价 verify。
+// 选「首用时生成」而非内嵌常量：参数始终跟随 hashPassword 当前默认，不会因
+// 升级 argon2 参数而漂移成不等价时延。
+let dummyHashPromise: Promise<string> | undefined;
+function dummyHash(): Promise<string> {
+  dummyHashPromise ??= hashPassword(randomBytes(32).toString('hex'));
+  return dummyHashPromise;
+}
+
+/** 进程内滑动窗口失败计数器（account+IP 维度）。 */
+class InMemoryLoginRateLimiter {
+  private readonly buckets = new Map<string, { count: number; windowStart: number }>();
+
+  constructor(
+    private readonly maxFailures: number,
+    private readonly windowMs: number,
+  ) {}
+
+  /** 窗口期内失败次数达到阈值即锁定；窗口过期顺手淘汰条目，Map 不无界增长。 */
+  isLocked(key: string): boolean {
+    const bucket = this.buckets.get(key);
+    if (bucket === undefined) {
+      return false;
+    }
+    if (Date.now() - bucket.windowStart >= this.windowMs) {
+      this.buckets.delete(key);
+      return false;
+    }
+    return bucket.count >= this.maxFailures;
+  }
+
+  recordFailure(key: string): void {
+    const now = Date.now();
+    const bucket = this.buckets.get(key);
+    if (bucket === undefined || now - bucket.windowStart >= this.windowMs) {
+      this.buckets.set(key, { count: 1, windowStart: now });
+      return;
+    }
+    bucket.count += 1;
+  }
+
+  clear(key: string): void {
+    this.buckets.delete(key);
+  }
+}
+
+export interface LoginResult {
+  sessionToken: string;
+  expiresAt: string;
+}
+
+export interface RenewalResult {
+  expiresAt: string;
+}
+
+@Injectable()
+export class AuthService {
+  private readonly sessionTtlSeconds: number;
+  private readonly rateLimiter = new InMemoryLoginRateLimiter(
+    LOGIN_RATE_LIMIT_MAX_FAILURES,
+    LOGIN_RATE_LIMIT_WINDOW_MS,
+  );
+
+  constructor(private readonly prisma: PrismaService) {
+    const raw = Number.parseInt(
+      process.env.AUTH_SESSION_TTL_SECONDS ?? '',
+      10,
+    );
+    this.sessionTtlSeconds =
+      Number.isFinite(raw) && raw > 0 ? raw : DEFAULT_SESSION_TTL_SECONDS;
+  }
+
+  async login(
+    account: string,
+    plainPassword: string,
+    ip: string,
+  ): Promise<LoginResult> {
+    // ① 限速先行：锁定期内不触 DB、不跑 argon2（即便密码正确也 429，
+    //    防止用「锁定与否」探测密码正确性）。
+    const rateKey = `${account}|${ip}`;
+    if (this.rateLimiter.isLocked(rateKey)) {
+      throw new ApiException(
+        ErrorCodes.AUTH_RATE_LIMITED,
+        'Too many failed login attempts; try again later',
+        HttpStatus.TOO_MANY_REQUESTS,
+      );
+    }
+
+    // ② 查用户：不存在 → dummy verify 拉平时延后与密码错误同响应。
+    const user = await this.prisma.users.findUnique({ where: { account } });
+    if (user === null) {
+      await verifyPassword(await dummyHash(), plainPassword);
+      this.rateLimiter.recordFailure(rateKey);
+      throw invalidCredentials();
+    }
+
+    // ③ 先验密码再查状态：状态不合格与密码错误同样不可区分（同 401 同文案；
+    //    argon2 在两条路径都真实跑过，时延也一致）。
+    if (!(await verifyPassword(user.passwordHash, plainPassword))) {
+      this.rateLimiter.recordFailure(rateKey);
+      throw invalidCredentials();
+    }
+    if (
+      user.sourceStatus === 'disabled' ||
+      user.localLocked ||
+      user.credentialStatus !== 'active'
+    ) {
+      // 密码已证实正确——不属于凭据猜测，不计入限速（限速针对撞库，
+      // 停用/待激活账号本就无法登录，计数无防护收益）。
+      throw invalidCredentials();
+    }
+
+    // ④ 签发会话：明文令牌仅本次返回；库存 sha256，expiresAt=now+TTL。
+    const sessionToken = randomBytes(32).toString('hex');
+    const session = await this.prisma.sessions.create({
+      data: {
+        userId: user.id,
+        tokenHash: hashSessionToken(sessionToken),
+        expiresAt: new Date(Date.now() + this.sessionTtlSeconds * 1000),
+      },
+    });
+    this.rateLimiter.clear(rateKey);
+
+    // ⑤ 审计（resourceId=会话 id：登录动作产出的资源即会话）。
+    await this.prisma.audit_logs.create({
+      data: {
+        actorId: user.id,
+        action: 'auth.login',
+        resourceId: session.id,
+        metadata: { ip },
+      },
+    });
+
+    return {
+      sessionToken,
+      expiresAt: session.expiresAt.toISOString(),
+    };
+  }
+
+  /**
+   * 滑动续期：同一令牌不轮换（会话行只前移 expiresAt）。
+   * 守卫已校验有效性；此处仍防御性复核（守卫与更新之间存在微小窗口，
+   * 且未来其它调用方可能绕过守卫）。
+   */
+  async refresh(sessionId: string): Promise<RenewalResult> {
+    const session = await this.prisma.sessions.findUnique({
+      where: { id: sessionId },
+    });
+    if (
+      session === null ||
+      session.revokedAt !== null ||
+      session.expiresAt.getTime() <= Date.now()
+    ) {
+      throw new ApiException(
+        ErrorCodes.AUTH_TOKEN_EXPIRED,
+        'Session token is missing, invalid, or expired',
+        HttpStatus.UNAUTHORIZED,
+      );
+    }
+    const expiresAt = new Date(Date.now() + this.sessionTtlSeconds * 1000);
+    await this.prisma.sessions.update({
+      where: { id: sessionId },
+      data: { expiresAt },
+    });
+    return { expiresAt: expiresAt.toISOString() };
+  }
+
+  /** 注销：置 revokedAt；幂等（updateMany 只在尚未撤销时落时间戳）。 */
+  async logout(sessionId: string): Promise<void> {
+    await this.prisma.sessions.updateMany({
+      where: { id: sessionId, revokedAt: null },
+      data: { revokedAt: new Date() },
+    });
+  }
+}
diff --git a/services/api/src/auth/dto.ts b/services/api/src/auth/dto.ts
new file mode 100644
index 0000000..1c32b58
--- /dev/null
+++ b/services/api/src/auth/dto.ts
@@ -0,0 +1,17 @@
+// services/api/src/auth/dto.ts —— auth 端点入参 DTO（Task 13）。
+// Nest 约定用 class-validator + class-transformer（非 zod）：装饰器元数据供全局
+// ValidationPipe（app-cn.module 经 APP_PIPE 注册）校验，失败抛 BadRequestException，
+// 由全局过滤器映射 400 VALIDATION_FAILED（契约各 auth 端点的 '400' 响应）。
+// 字段约束对齐契约 LoginRequest：account/password 均为非空字符串；契约未定义
+// 长度上限（users.account 列宽 64 由入库侧保证，超长账号查无此人不构成枚举面）。
+import { IsNotEmpty, IsString } from 'class-validator';
+
+export class LoginRequestDto {
+  @IsString()
+  @IsNotEmpty()
+  account!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  password!: string;
+}
diff --git a/services/api/src/auth/session.guard.ts b/services/api/src/auth/session.guard.ts
new file mode 100644
index 0000000..290de4c
--- /dev/null
+++ b/services/api/src/auth/session.guard.ts
@@ -0,0 +1,99 @@
+// services/api/src/auth/session.guard.ts —— Bearer 会话守卫（Task 13，规范化守卫）。
+// 解析 Authorization: Bearer <token> → sha256 查 sessions（users.level: include）
+// → 校验未撤销 / 未过期 / 用户仍具资格（credentialStatus=active 且 !localLocked
+// 且 sourceStatus!=disabled——技术文档「停用账号撤销会话」在守卫层落实：
+// 账号一旦停用，其既有令牌即刻失效，无需等过期）→ 挂载 req.user / req.sessionId。
+// 全部失败路径（头缺失/格式错/查无会话/已撤销/已过期/资格不符）抛同一
+// ApiException(AUTH_TOKEN_EXPIRED)：同一状态码 + 同一文案，不向调用方泄露失败原因。
+// 使用方式：@UseGuards(SessionGuard)（按控制器/路由启用，不注册 APP_GUARD）。
+// 守卫只依赖 @Global 的 PrismaService，任意模块可直接引用，无需 import AuthModule。
+import { createHash } from 'node:crypto';
+import {
+  type CanActivate,
+  type ExecutionContext,
+  HttpStatus,
+  Injectable,
+} from '@nestjs/common';
+import type { IncomingMessage } from 'node:http';
+import { ErrorCodes } from '@photo/contracts';
+import { ApiException } from '../api-exception';
+import { PrismaService } from '../prisma/prisma.service';
+import type { RequestWithId } from '../shared/request-with-id';
+
+/** 守卫挂载后的请求用户信息（后续业务模块经 req.user 读取的规范形状）。 */
+export interface AuthUser {
+  id: string;
+  account: string;
+  /** staff|admin（公司角色；相册角色由 album_members 承载，不进会话）。 */
+  role: string;
+  locale: string | null;
+}
+
+/** 经 SessionGuard 放行后的请求（组合而非继承，同 request-with-id.ts 的约定）。 */
+export interface AuthenticatedRequest extends RequestWithId {
+  user?: AuthUser;
+  /** 守卫命中的会话行 id：refresh/logout 需要定位会话本体（令牌本身不外传到业务层）。 */
+  sessionId?: string;
+  headers: IncomingMessage['headers'];
+}
+
+/** 令牌 → 库内存储哈希。32B hex 令牌的 sha256 hex 恰为 64 字符，合 tokenHash 列宽。 */
+export function hashSessionToken(token: string): string {
+  return createHash('sha256').update(token).digest('hex');
+}
+
+function tokenInvalid(): ApiException {
+  return new ApiException(
+    ErrorCodes.AUTH_TOKEN_EXPIRED,
+    'Session token is missing, invalid, or expired',
+    HttpStatus.UNAUTHORIZED,
+  );
+}
+
+@Injectable()
+export class SessionGuard implements CanActivate {
+  constructor(private readonly prisma: PrismaService) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const req =
+      context.switchToHttp().getRequest<AuthenticatedRequest>();
+
+    const header = req.headers.authorization;
+    if (typeof header !== 'string' || !header.startsWith('Bearer ')) {
+      throw tokenInvalid();
+    }
+    const token = header.slice('Bearer '.length).trim();
+    if (token === '') {
+      throw tokenInvalid();
+    }
+
+    const session = await this.prisma.sessions.findUnique({
+      where: { tokenHash: hashSessionToken(token) },
+      include: { user: true },
+    });
+    if (session === null) {
+      throw tokenInvalid();
+    }
+    if (session.revokedAt !== null || session.expiresAt.getTime() <= Date.now()) {
+      throw tokenInvalid();
+    }
+
+    const { user } = session;
+    if (
+      user.credentialStatus !== 'active' ||
+      user.localLocked ||
+      user.sourceStatus === 'disabled'
+    ) {
+      throw tokenInvalid();
+    }
+
+    req.user = {
+      id: user.id,
+      account: user.account,
+      role: user.role,
+      locale: user.locale,
+    };
+    req.sessionId = session.id;
+    return true;
+  }
+}
diff --git a/services/api/test/auth.e2e-spec.ts b/services/api/test/auth.e2e-spec.ts
new file mode 100644
index 0000000..1cfc93c
--- /dev/null
+++ b/services/api/test/auth.e2e-spec.ts
@@ -0,0 +1,283 @@
+// services/api/test/auth.e2e-spec.ts —— Task 13 登录/刷新/注销 e2e（先写后实现）。
+// 真实 app + MySQL（reset.ts 隔离，用户经 Prisma 直种）。覆盖：
+//   成功登录（令牌形状 / TTL / audit_logs / sessions.tokenHash）、
+//   凭据错误的三种 401 归并（错误密码 / 账号不存在 / 状态不合格——同码防枚举）、
+//   滑动续期（同令牌不轮换、过期时间前移）、垃圾/缺失令牌 401、
+//   注销 204 + 令牌即刻失效 + sessions.revokedAt、
+//   账号被停用后既有会话被守卫撤销、
+//   登录失败限速（第 6 次 429 AUTH_RATE_LIMITED；成功登录清零计数）、
+//   DTO 校验 400 VALIDATION_FAILED（全局校验管道）。
+// 限速计数在 app 实例内存中跨用例存留——各限速用例使用独立账号，避免相互污染；
+// alice 在首个用例失败 1 次后由成功登录清零，后续用例不受影响。
+import { createHash } from 'node:crypto';
+import { type INestApplication } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import request from 'supertest';
+import { PrismaClient } from '@photo/db-cn';
+import { ErrorCodes } from '@photo/contracts';
+import { AppCnModule } from '../src/app-cn.module';
+import { hashPassword } from '../src/auth/password';
+import { API_PREFIX } from '../src/shared/constants';
+import { resetDb } from './reset';
+
+const TTL_SECONDS = Number.parseInt(
+  process.env.AUTH_SESSION_TTL_SECONDS ?? '2592000',
+  10,
+);
+/** 断言容差：登录/续期到响应到达之间的真实耗时（本机 e2e 足够）。 */
+const TTL_TOLERANCE_MS = 120_000;
+
+function sha256Hex(value: string): string {
+  return createHash('sha256').update(value).digest('hex');
+}
+
+describe('auth (e2e)', () => {
+  let app: INestApplication;
+  let prisma: PrismaClient;
+  let aliceId: string;
+
+  const PASSWORD = 'correct-pass-1';
+
+  beforeAll(async () => {
+    await resetDb();
+    const moduleRef = await Test.createTestingModule({
+      imports: [AppCnModule],
+    }).compile();
+    app = moduleRef.createNestApplication();
+    app.setGlobalPrefix(API_PREFIX);
+    await app.init();
+
+    prisma = new PrismaClient();
+    const hash = await hashPassword(PASSWORD);
+    aliceId = (
+      await prisma.users.create({
+        data: { account: 'alice', passwordHash: hash, displayName: 'Alice' },
+        select: { id: true },
+      })
+    ).id;
+    // 状态不合格三态：停用 / 本地锁定 / 凭据待激活（A01 未激活无法进入）。
+    await prisma.users.create({
+      data: {
+        account: 'bob',
+        passwordHash: hash,
+        displayName: 'Bob',
+        sourceStatus: 'disabled',
+      },
+    });
+    await prisma.users.create({
+      data: {
+        account: 'carol',
+        passwordHash: hash,
+        displayName: 'Carol',
+        localLocked: true,
+      },
+    });
+    await prisma.users.create({
+      data: {
+        account: 'dave',
+        passwordHash: hash,
+        displayName: 'Dave',
+        credentialStatus: 'pending',
+      },
+    });
+    // 限速专用账号（与其它用例隔离，避免内存计数交叉污染）。
+    await prisma.users.create({
+      data: { account: 'erin', passwordHash: hash, displayName: 'Erin' },
+    });
+    await prisma.users.create({
+      data: { account: 'frank', passwordHash: hash, displayName: 'Frank' },
+    });
+    // 会话撤销语义专用账号（测试内会被置为 disabled，不复用其它账号）。
+    await prisma.users.create({
+      data: { account: 'gina', passwordHash: hash, displayName: 'Gina' },
+    });
+  });
+
+  afterAll(async () => {
+    await app.close();
+    await prisma.$disconnect();
+  });
+
+  function login(account: string, password: string) {
+    return request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/password`)
+      .send({ account, password });
+  }
+
+  it('正确账号密码 → 200 {sessionToken, expiresAt≈now+TTL}，tokenHash=sha256(token)，且写 audit_logs(auth.login)', async () => {
+    const before = Date.now();
+    const res = await login('alice', PASSWORD);
+    expect(res.status).toBe(200);
+    expect(Object.keys(res.body).sort()).toEqual(['expiresAt', 'sessionToken']);
+
+    const { sessionToken, expiresAt } = res.body as {
+      sessionToken: string;
+      expiresAt: string;
+    };
+    // 32B 随机数的 hex 编码。
+    expect(sessionToken).toMatch(/^[0-9a-f]{64}$/);
+
+    const expiresMs = Date.parse(expiresAt);
+    const lower = before + TTL_SECONDS * 1000 - TTL_TOLERANCE_MS;
+    const upper = before + TTL_SECONDS * 1000 + TTL_TOLERANCE_MS;
+    expect(expiresMs).toBeGreaterThanOrEqual(lower);
+    expect(expiresMs).toBeLessThanOrEqual(upper);
+
+    // 库内只存哈希；明文令牌不落库。
+    const session = await prisma.sessions.findUnique({
+      where: { tokenHash: sha256Hex(sessionToken) },
+    });
+    expect(session).not.toBeNull();
+    expect(session?.userId).toBe(aliceId);
+    expect(session?.revokedAt).toBeNull();
+
+    const audit = await prisma.audit_logs.findFirst({
+      where: { action: 'auth.login', actorId: aliceId },
+    });
+    expect(audit).not.toBeNull();
+  });
+
+  it('错误密码 → 401 AUTH_INVALID_CREDENTIALS', async () => {
+    const res = await login('alice', 'wrong-password');
+    expect(res.status).toBe(401);
+    expect(res.body.code).toBe(ErrorCodes.AUTH_INVALID_CREDENTIALS);
+    expect(typeof res.body.requestId).toBe('string');
+  });
+
+  it('不存在的账号 → 401 同一错误码（防账号枚举）', async () => {
+    const res = await login('ghost-account', 'whatever');
+    expect(res.status).toBe(401);
+    expect(res.body.code).toBe(ErrorCodes.AUTH_INVALID_CREDENTIALS);
+  });
+
+  it.each([
+    ['sourceStatus=disabled', 'bob'],
+    ['localLocked=true', 'carol'],
+    ['credentialStatus=pending（A01 未激活）', 'dave'],
+  ])('%s → 401 同一错误码（正确密码也不放行）', async (_label, account) => {
+    const res = await login(account as string, PASSWORD);
+    expect(res.status).toBe(401);
+    expect(res.body.code).toBe(ErrorCodes.AUTH_INVALID_CREDENTIALS);
+  });
+
+  it('请求体缺 password → 400 VALIDATION_FAILED（全局校验管道）', async () => {
+    const res = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/password`)
+      .send({ account: 'alice' });
+    expect(res.status).toBe(400);
+    expect(res.body.code).toBe(ErrorCodes.VALIDATION_FAILED);
+  });
+
+  it('滑动续期：有效令牌 → 200 {expiresAt} 前移，且旧令牌仍可用（不轮换）', async () => {
+    const loginRes = await login('alice', PASSWORD);
+    const token: string = loginRes.body.sessionToken;
+    const originalExpires: number = Date.parse(loginRes.body.expiresAt);
+
+    // 把会话过期时间手工缩短到即将过期，续期后应回到 ~now+TTL（前移可观测）。
+    await prisma.sessions.update({
+      where: { tokenHash: sha256Hex(token) },
+      data: { expiresAt: new Date(Date.now() + 60_000) },
+    });
+
+    const before = Date.now();
+    const res = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/refresh`)
+      .set('Authorization', `Bearer ${token}`);
+    expect(res.status).toBe(200);
+    expect(Object.keys(res.body)).toEqual(['expiresAt']);
+
+    const renewedMs = Date.parse(res.body.expiresAt);
+    expect(renewedMs).toBeGreaterThan(originalExpires);
+    expect(renewedMs).toBeGreaterThanOrEqual(
+      before + TTL_SECONDS * 1000 - TTL_TOLERANCE_MS,
+    );
+    expect(renewedMs).toBeLessThanOrEqual(
+      before + TTL_SECONDS * 1000 + TTL_TOLERANCE_MS,
+    );
+
+    // 不轮换：同一令牌再次续期仍 200（若实现为轮换，旧令牌应已失效）。
+    const again = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/refresh`)
+      .set('Authorization', `Bearer ${token}`);
+    expect(again.status).toBe(200);
+  });
+
+  it('续期携带垃圾令牌 → 401 AUTH_TOKEN_EXPIRED', async () => {
+    const res = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/refresh`)
+      .set('Authorization', 'Bearer not-a-real-token');
+    expect(res.status).toBe(401);
+    expect(res.body.code).toBe(ErrorCodes.AUTH_TOKEN_EXPIRED);
+  });
+
+  it('续期缺失 Authorization 头 → 401 AUTH_TOKEN_EXPIRED', async () => {
+    const res = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/refresh`);
+    expect(res.status).toBe(401);
+    expect(res.body.code).toBe(ErrorCodes.AUTH_TOKEN_EXPIRED);
+  });
+
+  it('注销 → 204 无响应体；同令牌后续受保护请求 401；sessions.revokedAt 落库', async () => {
+    const loginRes = await login('alice', PASSWORD);
+    const token: string = loginRes.body.sessionToken;
+
+    const logout = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/logout`)
+      .set('Authorization', `Bearer ${token}`);
+    expect(logout.status).toBe(204);
+    expect(logout.body).toEqual({});
+
+    const after = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/refresh`)
+      .set('Authorization', `Bearer ${token}`);
+    expect(after.status).toBe(401);
+    expect(after.body.code).toBe(ErrorCodes.AUTH_TOKEN_EXPIRED);
+
+    const session = await prisma.sessions.findUnique({
+      where: { tokenHash: sha256Hex(token) },
+      select: { revokedAt: true },
+    });
+    expect(session?.revokedAt).not.toBeNull();
+  });
+
+  it('账号被停用后，既有会话被守卫拒绝（撤销语义）', async () => {
+    const res = await login('gina', PASSWORD);
+    expect(res.status).toBe(200);
+    const token: string = res.body.sessionToken;
+
+    await prisma.users.update({
+      where: { account: 'gina' },
+      data: { sourceStatus: 'disabled' },
+    });
+
+    const refresh = await request(app.getHttpServer())
+      .post(`/${API_PREFIX}/auth/refresh`)
+      .set('Authorization', `Bearer ${token}`);
+    expect(refresh.status).toBe(401);
+    expect(refresh.body.code).toBe(ErrorCodes.AUTH_TOKEN_EXPIRED);
+  });
+
+  it('限速：同账号连续 5 次失败后，第 6 次（即使密码正确）→ 429 AUTH_RATE_LIMITED', async () => {
+    for (let i = 0; i < 5; i++) {
+      const res = await login('erin', 'wrong-password');
+      expect(res.status).toBe(401);
+      expect(res.body.code).toBe(ErrorCodes.AUTH_INVALID_CREDENTIALS);
+    }
+    const locked = await login('erin', PASSWORD);
+    expect(locked.status).toBe(429);
+    expect(locked.body.code).toBe(ErrorCodes.AUTH_RATE_LIMITED);
+  });
+
+  it('限速：成功登录清零失败计数（4 次失败 + 成功 + 再失败仍是 401 而非 429）', async () => {
+    for (let i = 0; i < 4; i++) {
+      const res = await login('frank', 'wrong-password');
+      expect(res.status).toBe(401);
+    }
+    const ok = await login('frank', PASSWORD);
+    expect(ok.status).toBe(200);
+
+    const res = await login('frank', 'wrong-password');
+    expect(res.status).toBe(401);
+    expect(res.body.code).toBe(ErrorCodes.AUTH_INVALID_CREDENTIALS);
+  });
+});