feat(recommend): 新增推荐频道页并恢复首页沉浸式信息流

- tab1 推荐页改为接口分类频道：频道导航可横滑，选中频道自动滚动到可视区，内容区左右滑动切换分类
- 精选频道：顶部固定高度 banner 轮播图 + 接口 tag 筛选的上新短剧横滑 + 其余短剧双列网格；其他分类三列网格
- 分类内容支持懒加载、下拉刷新与上拉分页加载
- 卡片角标文案与背景色取自接口 tag/tagColor，短剧标题统一白色
- 恢复 tab0 为沉浸式全屏视频首页及其三 inner-tab 顶导（搜索/礼物入口）
- l10n 新增原创出品、立即观看、上新、编辑精选、全N集等多语言文案

lib/l10n/app_localizations.dart

@@ -397,9 +397,21 @@ abstract class AppLocalizations {
   /// No description provided for @watchFullSeries.
   ///
   /// In en, this message translates to:
-  /// **'Watch full series · {episodes} eps'**
+  /// **'Watch full series  {episodes} eps'**
   String watchFullSeries(String episodes);
 
+  /// No description provided for @feedEpisodePrefix.
+  ///
+  /// In en, this message translates to:
+  /// **'EP{episode} | '**
+  String feedEpisodePrefix(int episode);
+
+  /// No description provided for @feedWatchingCount.
+  ///
+  /// In en, this message translates to:
+  /// **'{count} watching'**
+  String feedWatchingCount(String count);
+
   /// No description provided for @feedTabAnime.
   ///
   /// In en, this message translates to:
@@ -1198,6 +1210,36 @@ abstract class AppLocalizations {
   /// **'Original'**
   String get originalTag;
 
+  /// No description provided for @originalProduction.
+  ///
+  /// In en, this message translates to:
+  /// **'Original'**
+  String get originalProduction;
+
+  /// No description provided for @watchNowAction.
+  ///
+  /// In en, this message translates to:
+  /// **'Watch Now'**
+  String get watchNowAction;
+
+  /// No description provided for @newArrivalBadge.
+  ///
+  /// In en, this message translates to:
+  /// **'NEW'**
+  String get newArrivalBadge;
+
+  /// No description provided for @editorPick.
+  ///
+  /// In en, this message translates to:
+  /// **'Editor\'s Pick'**
+  String get editorPick;
+
+  /// No description provided for @totalEpisodesShort.
+  ///
+  /// In en, this message translates to:
+  /// **'{count} eps'**
+  String totalEpisodesShort(int count);
+
   /// No description provided for @dramaTag.
   ///
   /// In en, this message translates to: