feat(app): P0 batch 2+2.5 — local upload dedup with batch dialog, album switch check, file size guard

P0-1 层 1 本地查重：
  - checkDuplicates：同账号+同相册+state=completed+filename+bytes 匹配
  - EnqueueResult 返回 enqueued+duplicates+skipped
  - capture_page + album_detail_page：批量单次弹窗（非逐张）三选一
    [跳过重复上传非重复] [全部上传] [取消]

P0-8 相册上传开关预检：album_detail_page 入队前检查 uploadEnabled，
  关闭时提示「该相册已关闭上传」+ 不入队

P1-8 文件大小预检：preparer 限单文件 ≤100MB（磁盘满由 on Object 兜底）

P0-7 更正：上传并发限制已有（kMaxParallelUploads=2），v2 分析误报

397/397 全绿、analyze 0

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

apps/mobile/lib/l10n/app_en.arb

@@ -427,5 +427,6 @@
   "posterDownload": "Download poster image",
   "posterSaved": "Poster saved to gallery",
   "posterSaveFailed": "Failed to save poster",
-  "close": "Close"
+  "close": "Close",
+  "albumUploadDisabled": "Upload is disabled for this album"
 }

apps/mobile/lib/l10n/app_localizations.dart

@@ -2017,6 +2017,12 @@ abstract class AppLocalizations {
   /// In zh, this message translates to:
   /// **'关闭'**
   String get close;
+
+  /// No description provided for @albumUploadDisabled.
+  ///
+  /// In zh, this message translates to:
+  /// **'该相册已关闭上传，无法添加照片'**
+  String get albumUploadDisabled;
 }
 
 class _AppLocalizationsDelegate

apps/mobile/lib/l10n/app_localizations_en.dart

@@ -1031,4 +1031,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get close => 'Close';
+
+  @override
+  String get albumUploadDisabled => 'Upload is disabled for this album';
 }

apps/mobile/lib/l10n/app_localizations_zh.dart

@@ -998,4 +998,7 @@ class AppLocalizationsZh extends AppLocalizations {
 
   @override
   String get close => '关闭';
+
+  @override
+  String get albumUploadDisabled => '该相册已关闭上传，无法添加照片';
 }

apps/mobile/lib/l10n/app_zh.arb

@@ -427,5 +427,6 @@
   "posterDownload": "下载海报图",
   "posterSaved": "海报已保存到相册",
   "posterSaveFailed": "海报保存失败",
-  "close": "关闭"
+  "close": "关闭",
+  "albumUploadDisabled": "该相册已关闭上传，无法添加照片"
 }