feat(uploads): P0-1 batch 4 — server-side duplicate photo detection (409 + force + index)

契约 UploadInitRequest 加 force（bool，仅 owner/admin 跳过查重）。
服务端 init 事务前置查重：同 albumId + uploaderId + bytes 的非 deleted
照片已存在 → 409 PHOTO_DUPLICATE。photos 表加 idx_photos_dedup 索引
（迁移 20260928120000）。
App UploadInitRequest 加 force 字段 + toJson 序列化。
本地查重（层 1）+ 服务端查重（层 2）双层防线到位。

API typecheck ✅ · app analyze ✅ · 397/397 ✅ · contract lint ✅

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

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**