feat(app): wire server dedup - force passthrough + PHOTO_DUPLICATE classification & l10n

Task 8: close the gap between server-side duplicate detection (90dcc58)
and the app.

- ApiClient.mapDioException: normalize 409 wire body reusing
  VALIDATION_FAILED with message=PHOTO_DUPLICATE to
  ErrorCodes.photoDuplicate (message-based; auto-compat if the contract
  later adds a dedicated code)
- l10n zh/en errorPhotoDuplicate; error_l10n maps the code (queue page
  inherits via fallback)
- UploadEngine._classifyFailure: PHOTO_DUPLICATE joins the no-auto-retry
  bucket (retrying the same init body would 409 again); force to skip
  dedup travels only through the enqueue path
- UploadTasks drift table +force column (schema v2, addColumn migration;
  legacy rows default false); UploadTaskDraft/UploadTask/prepare carry it
- enqueueForUpload +forcePaths; duplicate dialog "全部上传" (capture page
  + album detail page) now returns DuplicateDialogChoice so confirmed
  duplicates enqueue with force=true (server adjudicates owner/admin)
- engine init body carries force only when true (absent otherwise)

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

apps/mobile/lib/features/uploads/task_store.dart

@@ -89,6 +89,11 @@ class UploadTasks extends Table {
   TextColumn get state =>
       text().map(const _UploadTaskStateConverter())();
 
+  /// 用户已确认强传（P0-1 Task 8）：查重弹窗「全部上传」入队的任务置
+  /// true，initUpload 携带 force 跳过服务端查重（仅 owner/admin 生效，
+  /// 服务端裁决）。缺省 false（正常查重）。
+  BoolColumn get force => boolean().withDefault(const Constant(false))();
+
   /// 已尝试传输次数（退避与上限判断依据）。
   IntColumn get attempt => integer().withDefault(const Constant(0))();
 
@@ -128,8 +133,18 @@ class UploadTaskDb extends _$UploadTaskDb {
   /// 测试用内存库（drift NativeDatabase.memory，随 close 丢弃）。
   UploadTaskDb.memory() : super(NativeDatabase.memory());
 
+  /// v1：初始表；v2（Task 8）：+force 列（查重弹窗「全部上传」强传标记）。
   @override
-  int get schemaVersion => 1;
+  int get schemaVersion => 2;
+
+  @override
+  MigrationStrategy get migration => MigrationStrategy(
+        onUpgrade: (m, from, to) async {
+          if (from == 1) {
+            await m.addColumn(uploadTasks, uploadTasks.force);
+          }
+        },
+      );
 }
 
 /// 打开生产库：app documents 目录下 upload_tasks.sqlite，后台 isolate 执行
@@ -154,6 +169,7 @@ class UploadTaskDraft {
     required this.filename,
     required this.bytes,
     required this.contentType,
+    this.force = false,
   });
 
   /// 任务 ID（uuid，调用方生成）。
@@ -182,6 +198,9 @@ class UploadTaskDraft {
 
   /// MIME 类型。
   final String contentType;
+
+  /// 用户已确认强传（查重弹窗「全部上传」）；initUpload 携带 force。
+  final bool force;
 }
 
 /// 状态迁移时一并写入的旁路字段（未提供的列保持不变；`null` 与"清除"通过
@@ -279,6 +298,7 @@ class TaskStore {
               filename: draft.filename,
               bytes: draft.bytes,
               contentType: draft.contentType,
+              force: Value(draft.force),
               state: UploadTaskState.preparing,
               createdAt: timestamp,
               updatedAt: timestamp,