diff --git a/apps/mobile/lib/features/uploads/models.dart b/apps/mobile/lib/features/uploads/models.dart
index d885729..a50bbd8 100644
--- a/apps/mobile/lib/features/uploads/models.dart
+++ b/apps/mobile/lib/features/uploads/models.dart
@@ -93,6 +93,7 @@ class UploadInitRequest {
     required this.contentType,
     this.categoryId,
     this.sourceDeviceId,
+    this.force = false,
   });
 
   /// 目标相册 ID。
@@ -116,6 +117,9 @@ class UploadInitRequest {
   /// 发起设备标识（可选，minLength 8 / maxLength 64；A19）。
   final String? sourceDeviceId;
 
+  /// P0-1 层 2：跳过服务端查重（仅 owner/admin 生效）。缺省 false。
+  final bool force;
+
   Map<String, dynamic> toJson() => {
         'albumId': albumId,
         if (categoryId != null) 'categoryId': categoryId,
@@ -124,6 +128,7 @@ class UploadInitRequest {
         'bytes': bytes,
         'contentType': contentType,
         if (sourceDeviceId != null) 'sourceDeviceId': sourceDeviceId,
+        if (force) 'force': true,
       };
 }
 
diff --git a/docs/plans/2026-09-28-App上传提速与无限制选图-实施计划.md b/docs/plans/2026-09-28-App上传提速与无限制选图-实施计划.md
index 87c1d15..89022d7 100644
--- a/docs/plans/2026-09-28-App上传提速与无限制选图-实施计划.md
+++ b/docs/plans/2026-09-28-App上传提速与无限制选图-实施计划.md
@@ -23,7 +23,7 @@
 
 | 问题 | 根因 | 证据 |
 |---|---|---|
-| 上传慢 | 并行传输上限=2；准备阶段两层串行；进度回调每 64KB 一次 | `upload_engine.dart:55`、`enqueue.dart:54`、`preparer.dart:117`（`_serialize`）、`UploadPutExecutor.kt:74` |
+| 上传慢 | 并行传输上限=2；准备阶段两层串行；进度回调每 64KB 一次 | `upload_engine.dart:55`、`enqueue.dart:153`（for-await 串行）、`preparer.dart:117`（`_serialize`）、`UploadPutExecutor.kt:74` |
 | 一次最多 100 张 | Android 系统 Photo Picker 平台上限 `MediaStore.getPickImagesMaxLimit()`（多数设备=100），app/服务端无此限制 | image_picker_android `ImagePickerUtils.getMaxItems()` |
 | 只能逐张点选 | 系统 Photo Picker UI 不支持区间拖选/全选，平台限制无解 | 同上 |
 
@@ -188,27 +188,28 @@ git commit -m "feat(app): bounded-parallel prepare (default 3) replaces serial q
 ### Task 3: enqueueForUpload 并行收集
 
 **Files:**
-- Modify: `apps/mobile/lib/features/uploads/enqueue.dart:52-63`
+- Modify: `apps/mobile/lib/features/uploads/enqueue.dart:152-167`
 
-说明：Task 2 后 preparer 内部已限流，外层 for-await 循环改为 `Future.wait` 即可；返回值语义（成功入队张数）不变。页级测试（album_detail/capture_page 断言入队数）已覆盖该语义。
+说明：Task 2 后 preparer 内部已限流，外层 for-await 循环改为 `Future.wait` 即可。**注意：`enqueueForUpload` 已是 P0-1 结构（返回 `EnqueueResult`，`skipPaths` 过滤在函数内）**——并行化只改循环段，保留 `effective` 过滤与返回结构。
 
-- [ ] **Step 1: 替换循环**
+- [ ] **Step 1: 替换循环段（152-161 行）**
 
 ```dart
-  final preparer = ref.read(uploadPreparerProvider);
   final results = await Future.wait(
-    sourcePaths.map((path) => preparer.prepare(
+    effective.map((path) => preparer.prepare(
           accountId: accountId,
           albumId: albumId,
           categoryId: categoryId,
           sourcePath: path,
         )),
   );
-  return results
+  final enqueued = results
       .where((task) => task.state == UploadTaskState.queued)
       .length;
 ```
 
+（返回 `EnqueueResult(enqueued: enqueued, duplicates: [], skipped: sourcePaths.length - effective.length)` 原样保留。）
+
 - [ ] **Step 2: 跑页级测试**
 
 Run: `cd apps/mobile && flutter test test/pages/album_detail_page_test.dart test/pages/capture_page_test.dart`
@@ -306,9 +307,9 @@ git commit -m "perf(app): throttle upload progress callbacks to 256KB steps"
 - Modify: `apps/mobile/pubspec.yaml`
 - Modify: `apps/mobile/android/app/src/main/AndroidManifest.xml`
 - Modify: `apps/mobile/lib/features/uploads/enqueue.dart`
-- Modify: `apps/mobile/lib/pages/album_detail_page.dart:331`
+- Modify: `apps/mobile/lib/pages/album_detail_page.dart:341`
 - Modify: `apps/mobile/lib/pages/capture_page.dart:307`
-- Test: `apps/mobile/test/pages/album_detail_page_test.dart:338`、`test/pages/capture_page_test.dart:179`（及 grep 命中的其余 override）
+- Test: `apps/mobile/test/pages/album_detail_page_test.dart:338`、`test/pages/capture_page_test.dart:179`、`integration_test/helpers/app_boot.dart:96`（及 grep 命中的其余 override）
 
 - [ ] **Step 1: 加依赖**
 
@@ -351,7 +352,7 @@ typedef 增加BuildContext（picker 需页面上下文）：
 typedef MultiImagePicker = Future<List<String>> Function(BuildContext context);
 ```
 
-provider 实现：
+provider 实现（文案代理用包内置的 locale 解析助手，勿手写 `<语言>TextDelegate` 类名——10.x 导出名不含 `ChineseTextDelegate`）：
 
 ```dart
 /// 多图选择 Provider（生产=wechat_assets_picker；测试 override）。
@@ -364,15 +365,12 @@ provider 实现：
 final multiImagePickerProvider = Provider<MultiImagePicker>(
   (ref) => (context) async {
     final locale = Localizations.maybeLocaleOf(context);
-    final textDelegate = locale?.languageCode == 'zh'
-        ? const ChineseTextDelegate()
-        : const EnglishTextDelegate();
     final assets = await AssetPicker.pickAssets(
       context,
       pickerConfig: AssetPickerConfig(
         requestType: RequestType.image,
         maxAssets: kPickerSoftMaxAssets,
-        textDelegate: textDelegate,
+        textDelegate: assetPickerTextDelegateFromLocale(locale),
       ),
     );
     if (assets == null) return const <String>[];
@@ -398,11 +396,13 @@ import 'package:wechat_assets_picker/wechat_assets_picker.dart';
 
 - [ ] **Step 4: 更新两处调用点**
 
-`album_detail_page.dart` `_pickFromGallery`：
+`album_detail_page.dart:341` `_pickFromGallery`（picker 需要 context，且此处在 `await _currentAccountId()` 之后——补 mounted 守卫防 `use_build_context_synchronously` lint）：
 ```dart
+    final account = await _currentAccountId();
+    if (account == null || !mounted) return;
     final paths = await ref.read(multiImagePickerProvider)(context);
 ```
-`capture_page.dart` `_pickFromGallery` 同样改为 `(context)`。
+`capture_page.dart:307` `_pickFromGallery` 同样改为 `(context)`（该处在任何 await 之前取 context，无 mounted 问题）。
 
 - [ ] **Step 5: 更新测试替身签名**
 
@@ -413,7 +413,14 @@ import 'package:wechat_assets_picker/wechat_assets_picker.dart';
                 .overrideWith((ref) => (context) async => galleryPaths),
 ```
 
-Run: `cd apps/mobile && grep -rn "multiImagePickerProvider" test/ lib/` 确认无遗漏签名。
+**集成测试替身**（`integration_test/helpers/app_boot.dart:96`）同步改签名：
+
+```dart
+        multiImagePickerProvider
+            .overrideWithValue((context) async => picker.consume()),
+```
+
+Run: `cd apps/mobile && grep -rn "multiImagePickerProvider" lib/ test/ integration_test/` 确认无遗漏签名。
 
 - [ ] **Step 6: 全量测试 + 静态检查**
 
diff --git a/packages/contracts/openapi.yaml b/packages/contracts/openapi.yaml
index 3f1ab47..301932a 100644
--- a/packages/contracts/openapi.yaml
+++ b/packages/contracts/openapi.yaml
@@ -3390,6 +3390,13 @@ components:
           description: |
             客户端首次生成并持久化的设备标识；服务端历史返回用于区分上传来源
             （A19）。可选；同一 clientTaskId 幂等重放时保留首次落库的值。
+        force:
+          type: boolean
+          default: false
+          description: |
+            跳过服务端查重（P0-1 层 2）。仅相册 owner/admin 可用；协作者
+            传 true 无效。false（缺省）时：同 albumId+uploaderId+bytes
+            已有非 deleted 照片 → 409 PHOTO_DUPLICATE。
 
     UploadCredential:
       type: object
diff --git a/packages/contracts/src/generated/openapi.d.ts b/packages/contracts/src/generated/openapi.d.ts
index cc2e46a..73c214a 100644
--- a/packages/contracts/src/generated/openapi.d.ts
+++ b/packages/contracts/src/generated/openapi.d.ts
@@ -1648,6 +1648,13 @@ export interface components {
              *     （A19）。可选；同一 clientTaskId 幂等重放时保留首次落库的值。
              */
             sourceDeviceId?: string;
+            /**
+             * @description 跳过服务端查重（P0-1 层 2）。仅相册 owner/admin 可用；协作者
+             *     传 true 无效。false（缺省）时：同 albumId+uploaderId+bytes
+             *     已有非 deleted 照片 → 409 PHOTO_DUPLICATE。
+             * @default false
+             */
+            force: boolean;
         };
         /** @description staging 对象的临时直传凭证；仅可写入指定 objectKey，不可访问 originals/variants。 */
         UploadCredential: {
diff --git a/packages/db-cn/prisma/migrations/20260928120000_photos_dedup_index/migration.sql b/packages/db-cn/prisma/migrations/20260928120000_photos_dedup_index/migration.sql
new file mode 100644
index 0000000..c9302f2
--- /dev/null
+++ b/packages/db-cn/prisma/migrations/20260928120000_photos_dedup_index/migration.sql
@@ -0,0 +1,4 @@
+-- P0-1 层 2：服务端查重索引（同相册+上传者+字节数匹配）
+-- 命中即 409 PHOTO_DUPLICATE（force=true 且 owner/admin 可跳过）。
+CREATE INDEX idx_photos_dedup
+  ON photos (albumId, uploaderId, bytes);
diff --git a/services/api/src/uploads/dto.ts b/services/api/src/uploads/dto.ts
index 49a11a1..7966aea 100644
--- a/services/api/src/uploads/dto.ts
+++ b/services/api/src/uploads/dto.ts
@@ -5,7 +5,7 @@
 //     惰性读取，故在服务层校验（同 filename 扩展名白名单与 categoryId 属主校验）；
 //   · clientTaskId/filename/albumId/categoryId 列宽对齐 db-cn schema
 //     （VarChar 128/255/64/64）；sourceDeviceId 8-64（A19 设备来源语义）。
-import {
+import { IsBoolean,
   IsIn,
   IsInt,
   IsNotEmpty,
@@ -55,4 +55,9 @@ export class UploadInitRequestDto {
   @MinLength(8)
   @MaxLength(64)
   sourceDeviceId?: string;
+
+  /** P0-1 层 2：跳过服务端查重（仅 owner/admin 生效；协作者无效）。 */
+  @IsOptional()
+  @IsBoolean()
+  force?: boolean;
 }
diff --git a/services/api/src/uploads/uploads.service.ts b/services/api/src/uploads/uploads.service.ts
index 7f0fb53..5978ded 100644
--- a/services/api/src/uploads/uploads.service.ts
+++ b/services/api/src/uploads/uploads.service.ts
@@ -120,6 +120,27 @@ export class UploadsService {
     if (!album.uploadEnabled) {
       throw albumUploadDisabled();
     }
+
+    // ③.5 P0-1 层 2：服务端查重——同相册+同上传者+同字节数的非 deleted 照片
+    // 已存在时 409（force=true 且 owner/admin 可跳过；协作者 force 无效）。
+    if (dto.force !== true || !(await this.permissions.canManageAlbum(user, dto.albumId))) {
+      const duplicate = await this.prisma.photos.findFirst({
+        where: {
+          albumId: dto.albumId,
+          uploaderId: user.id,
+          bytes: dto.bytes,
+          visibility: { not: 'deleted' },
+        },
+        select: { id: true, uploadedAt: true },
+      });
+      if (duplicate !== null) {
+        throw new ApiException(
+          ErrorCodes.VALIDATION_FAILED,
+          'PHOTO_DUPLICATE',
+          HttpStatus.CONFLICT,
+        );
+      }
+    }
     // ④ 大小限额（惰性读 env）与 filename 扩展名白名单（对象键后缀派生）。
     const maxBytes = uploadMaxBytes();
     if (dto.bytes > maxBytes) {