feat: A3-A6 数据层（内容/播放/记录收藏/互动的 HTTP 对接）

- AppCatalog 模型（feed/section/card/detail/episode/banner/category）
- HttpCatalogRepository 对接首页/发现/分类/详情
- PlaybackRepository 播放票据、WatchRepository 记录收藏
- InteractionRepository 评论点赞举报、WalletRepository 钱包解锁

lib/core/data/models/app_catalog.dart

@@ -0,0 +1,188 @@
+// Author: fruit.com.cn
+
+// 与后端 /app/** 内容接口对齐的数据模型。
+
+class AppEpisode {
+  AppEpisode({
+    required this.id,
+    required this.number,
+    required this.title,
+    required this.durationSec,
+    required this.locked,
+    required this.unlockCoin,
+    this.playUrl,
+  });
+
+  final int id;
+  final int number;
+  final String title;
+  final int durationSec;
+  final bool locked;
+  final int unlockCoin;
+  final String? playUrl;
+
+  factory AppEpisode.fromJson(Map<String, dynamic> json) => AppEpisode(
+    id: json['id'] as int,
+    number: json['number'] as int,
+    title: json['title'] as String? ?? '',
+    durationSec: json['durationSec'] as int? ?? 0,
+    locked: json['locked'] as bool? ?? false,
+    unlockCoin: json['unlockCoin'] as int? ?? 0,
+    playUrl: json['playUrl'] as String?,
+  );
+}
+
+class AppDramaCard {
+  AppDramaCard({
+    required this.id,
+    required this.title,
+    required this.cover,
+    required this.synopsis,
+    required this.genre,
+    required this.category,
+    required this.totalEpisodes,
+    required this.isHot,
+    required this.viewCount,
+    this.preview,
+  });
+
+  final int id;
+  final String title;
+  final String cover;
+  final String synopsis;
+  final String genre;
+  final String category;
+  final int totalEpisodes;
+  final bool isHot;
+  final int viewCount;
+  final AppEpisode? preview;
+
+  factory AppDramaCard.fromJson(Map<String, dynamic> json) => AppDramaCard(
+    id: json['id'] as int,
+    title: json['title'] as String? ?? '',
+    cover: json['cover'] as String? ?? '',
+    synopsis: json['synopsis'] as String? ?? '',
+    genre: json['genre'] as String? ?? '',
+    category: json['category'] as String? ?? '',
+    totalEpisodes: json['totalEpisodes'] as int? ?? 0,
+    isHot: json['isHot'] as bool? ?? false,
+    viewCount: json['viewCount'] as int? ?? 0,
+    preview: json['preview'] == null
+        ? null
+        : AppEpisode.fromJson(json['preview'] as Map<String, dynamic>),
+  );
+}
+
+class AppDramaDetail {
+  AppDramaDetail({
+    required this.id,
+    required this.title,
+    required this.synopsis,
+    required this.cover,
+    required this.genre,
+    required this.category,
+    required this.totalEpisodes,
+    required this.freeEpisodes,
+    required this.unlockCoin,
+    required this.isHot,
+    required this.viewCount,
+    required this.episodes,
+  });
+
+  final int id;
+  final String title;
+  final String synopsis;
+  final String cover;
+  final String genre;
+  final String category;
+  final int totalEpisodes;
+  final int freeEpisodes;
+  final int unlockCoin;
+  final bool isHot;
+  final int viewCount;
+  final List<AppEpisode> episodes;
+
+  factory AppDramaDetail.fromJson(Map<String, dynamic> json) => AppDramaDetail(
+    id: json['id'] as int,
+    title: json['title'] as String? ?? '',
+    synopsis: json['synopsis'] as String? ?? '',
+    cover: json['cover'] as String? ?? '',
+    genre: json['genre'] as String? ?? '',
+    category: json['category'] as String? ?? '',
+    totalEpisodes: json['totalEpisodes'] as int? ?? 0,
+    freeEpisodes: json['freeEpisodes'] as int? ?? 0,
+    unlockCoin: json['unlockCoin'] as int? ?? 0,
+    isHot: json['isHot'] as bool? ?? false,
+    viewCount: json['viewCount'] as int? ?? 0,
+    episodes: (json['episodes'] as List? ?? const [])
+        .map((e) => AppEpisode.fromJson(e as Map<String, dynamic>))
+        .toList(),
+  );
+}
+
+class AppBanner {
+  AppBanner({
+    required this.id,
+    required this.imageUrl,
+    required this.linkType,
+    required this.linkValue,
+  });
+
+  final int id;
+  final String imageUrl;
+  final String linkType;
+  final String linkValue;
+
+  factory AppBanner.fromJson(Map<String, dynamic> json) => AppBanner(
+    id: json['id'] as int,
+    imageUrl: json['imageUrl'] as String? ?? '',
+    linkType: json['linkType'] as String? ?? '',
+    linkValue: json['linkValue'] as String? ?? '',
+  );
+}
+
+class AppCategory {
+  AppCategory({required this.id, required this.name});
+
+  final int id;
+  final String name;
+
+  factory AppCategory.fromJson(Map<String, dynamic> json) =>
+      AppCategory(id: json['id'] as int, name: json['name'] as String? ?? '');
+}
+
+class AppSection {
+  AppSection({
+    required this.code,
+    required this.title,
+    required this.dramas,
+  });
+
+  final String code;
+  final String title;
+  final List<AppDramaCard> dramas;
+
+  factory AppSection.fromJson(Map<String, dynamic> json) => AppSection(
+    code: json['code'] as String? ?? '',
+    title: json['title'] as String? ?? '',
+    dramas: (json['dramas'] as List? ?? const [])
+        .map((e) => AppDramaCard.fromJson(e as Map<String, dynamic>))
+        .toList(),
+  );
+}
+
+class AppFeed {
+  AppFeed({required this.banners, required this.sections});
+
+  final List<AppBanner> banners;
+  final List<AppSection> sections;
+
+  factory AppFeed.fromJson(Map<String, dynamic> json) => AppFeed(
+    banners: (json['banners'] as List? ?? const [])
+        .map((e) => AppBanner.fromJson(e as Map<String, dynamic>))
+        .toList(),
+    sections: (json['sections'] as List? ?? const [])
+        .map((e) => AppSection.fromJson(e as Map<String, dynamic>))
+        .toList(),
+  );
+}