chore(api): p1a final-review hygiene items

- contracts: add NOT_FOUND error code (framework-level 404 for unknown
  routes); Error enum + regen committed
- api: 404 default mapping in AllExceptionsFilter now NOT_FOUND (was
  ALBUM_NOT_FOUND); business 404s unchanged via explicit ApiException codes
- api: extract configureApp (prefix/CORS/x-powered-by) shared by main-cn
  bootstrap and e2e; disable x-powered-by, asserted in e2e
- api: move parseCursor/parseLimit (+page-size bounds) from
  albums.controller to shared/pagination; members/uploads/public re-pointed
- infra: bind compose published ports to 127.0.0.1 (mysql/redis/minio);
  .env.example endpoints follow suit
- e2e: unknown-route 404 NOT_FOUND + x-powered-by absent cases added
  (api e2e 120 -> 122)

Co-Authored-By: Claude Code <noreply@anthropic.com>

services/api/src/albums/members.controller.ts

@@ -1,7 +1,7 @@
 // services/api/src/albums/members.controller.ts —— /albums/{albumId}/members
 // 端点（Task 17）。方法名与契约 operationId 一一对应（addAlbumMember/
 // listAlbumMembers/removeAlbumMember）。控制器级 SessionGuard：三端点全需
-// 认证。控制器只做认证用户透传 + 查询参数规整（复用 albums.controller 的
+// 认证。控制器只做认证用户透传 + 查询参数规整（shared/pagination 的
 // parseLimit/parseCursor，同一契约 bounds/游标语义）；权限与 HTTP 映射由
 // MembersService 抛 ApiException（404 ALBUM_NOT_FOUND / 403 AUTH_FORBIDDEN /
 // 409 MEMBER_CONFLICT）。
@@ -19,7 +19,8 @@ import {
   UseGuards,
 } from '@nestjs/common';
 import { AuthenticatedRequest, SessionGuard } from '../auth/session.guard';
-import { parseCursor, parseLimit, userOf } from './albums.controller';
+import { userOf } from './albums.controller';
+import { parseCursor, parseLimit } from '../shared/pagination';
 import { MemberAddRequestDto } from './dto';
 import {
   type MemberListResponse,