diff --git a/lib/core/data/models/app_catalog.dart b/lib/core/data/models/app_catalog.dart
new file mode 100644
index 0000000..ba898b6
--- /dev/null
+++ b/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(),
+  );
+}
diff --git a/lib/core/data/repositories/http_catalog_repository.dart b/lib/core/data/repositories/http_catalog_repository.dart
new file mode 100644
index 0000000..0e9bb37
--- /dev/null
+++ b/lib/core/data/repositories/http_catalog_repository.dart
@@ -0,0 +1,33 @@
+// Author: fruit.com.cn
+
+import '../models/app_catalog.dart';
+import '../services/api_client.dart';
+
+/// 对接后端 `/app/**` 内容接口（A3）。
+class HttpCatalogRepository {
+  HttpCatalogRepository(this._client);
+
+  final ApiClient _client;
+
+  Future<AppFeed> fetchHomeFeed() async {
+    final data = await _client.get('/app/home/feed');
+    return AppFeed.fromJson(data as Map<String, dynamic>);
+  }
+
+  Future<AppFeed> fetchDiscoverFeed() async {
+    final data = await _client.get('/app/discover/feed');
+    return AppFeed.fromJson(data as Map<String, dynamic>);
+  }
+
+  Future<List<AppCategory>> fetchCategories() async {
+    final data = await _client.get('/app/categories');
+    return (data as List)
+        .map((e) => AppCategory.fromJson(e as Map<String, dynamic>))
+        .toList();
+  }
+
+  Future<AppDramaDetail> fetchDramaDetail(int id) async {
+    final data = await _client.get('/app/dramas/$id');
+    return AppDramaDetail.fromJson(data as Map<String, dynamic>);
+  }
+}
diff --git a/lib/core/data/repositories/interaction_repository.dart b/lib/core/data/repositories/interaction_repository.dart
new file mode 100644
index 0000000..eb58428
--- /dev/null
+++ b/lib/core/data/repositories/interaction_repository.dart
@@ -0,0 +1,61 @@
+// Author: fruit.com.cn
+
+import '../services/api_client.dart';
+
+/// 评论、点赞、举报（A6）。
+class InteractionRepository {
+  InteractionRepository(this._client);
+
+  final ApiClient _client;
+
+  Future<void> postComment({
+    required int dramaId,
+    required String content,
+    int? rootId,
+  }) async {
+    await _client.post('/app/comments', data: {
+      'dramaId': dramaId,
+      'content': content,
+      if (rootId != null) 'rootId': rootId,
+    });
+  }
+
+  Future<List<dynamic>> fetchComments({
+    required int dramaId,
+    int? cursor,
+    int size = 20,
+  }) async {
+    final data = await _client.get('/app/comments', query: {
+      'dramaId': dramaId,
+      if (cursor != null) 'cursor': cursor,
+      'size': size,
+    });
+    return data as List;
+  }
+
+  Future<void> deleteComment(int id) async {
+    await _client.delete('/app/comments/$id');
+  }
+
+  Future<void> toggleLike({
+    required String targetType,
+    required int targetId,
+  }) async {
+    await _client.post('/app/likes/toggle', data: {
+      'targetType': targetType,
+      'targetId': targetId,
+    });
+  }
+
+  Future<void> report({
+    required String targetType,
+    required int targetId,
+    required String reason,
+  }) async {
+    await _client.post('/app/reports', data: {
+      'targetType': targetType,
+      'targetId': targetId,
+      'reason': reason,
+    });
+  }
+}
diff --git a/lib/core/data/repositories/playback_repository.dart b/lib/core/data/repositories/playback_repository.dart
new file mode 100644
index 0000000..1510d86
--- /dev/null
+++ b/lib/core/data/repositories/playback_repository.dart
@@ -0,0 +1,16 @@
+// Author: fruit.com.cn
+
+import '../services/api_client.dart';
+
+/// 播放票据（A4）。
+class PlaybackRepository {
+  PlaybackRepository(this._client);
+
+  final ApiClient _client;
+
+  /// 签发播放票据与签名地址，客户端原样使用 playUrl。
+  Future<Map<String, dynamic>> fetchPlayTicket(int episodeId) async {
+    final data = await _client.get('/app/episodes/$episodeId/play');
+    return data as Map<String, dynamic>;
+  }
+}
diff --git a/lib/core/data/repositories/wallet_repository.dart b/lib/core/data/repositories/wallet_repository.dart
new file mode 100644
index 0000000..6eeccbe
--- /dev/null
+++ b/lib/core/data/repositories/wallet_repository.dart
@@ -0,0 +1,25 @@
+// Author: fruit.com.cn
+
+import '../services/api_client.dart';
+
+/// 钱包、金币解锁（09 收费支付）。
+class WalletRepository {
+  WalletRepository(this._client);
+
+  final ApiClient _client;
+
+  Future<Map<String, dynamic>> fetchWallet() async {
+    final data = await _client.get('/app/wallet');
+    return data as Map<String, dynamic>;
+  }
+
+  Future<Map<String, dynamic>> unlockEpisode(int episodeId) async {
+    final data = await _client.post('/app/episodes/$episodeId/unlock');
+    return data as Map<String, dynamic>;
+  }
+
+  Future<List<dynamic>> fetchOrders() async {
+    final data = await _client.get('/app/orders');
+    return data as List;
+  }
+}
diff --git a/lib/core/data/repositories/watch_repository.dart b/lib/core/data/repositories/watch_repository.dart
new file mode 100644
index 0000000..5ab59b0
--- /dev/null
+++ b/lib/core/data/repositories/watch_repository.dart
@@ -0,0 +1,59 @@
+// Author: fruit.com.cn
+
+import '../services/api_client.dart';
+
+/// 观看记录与收藏（A5）。
+class WatchRepository {
+  WatchRepository(this._client);
+
+  final ApiClient _client;
+
+  Future<void> reportProgress({
+    required int episodeId,
+    required int positionSec,
+    required int durationSec,
+  }) async {
+    await _client.post('/app/watch/progress', data: {
+      'episodeId': episodeId,
+      'positionSec': positionSec,
+      'durationSec': durationSec,
+    });
+  }
+
+  Future<Map<String, dynamic>> fetchProgress(int dramaId) async {
+    final data = await _client.get('/app/watch/progress', query: {
+      'dramaId': dramaId,
+    });
+    return data as Map<String, dynamic>;
+  }
+
+  Future<List<dynamic>> fetchRecent({int limit = 20}) async {
+    final data = await _client.get('/app/watch/recent', query: {'limit': limit});
+    return data as List;
+  }
+
+  Future<void> deleteProgress(int dramaId) async {
+    await _client.delete('/app/watch/progress/$dramaId');
+  }
+
+  Future<void> clearProgress() async {
+    await _client.delete('/app/watch/progress');
+  }
+
+  Future<bool> toggleFavorite(int dramaId) async {
+    final data = await _client.post('/app/favorites/toggle', data: {
+      'dramaId': dramaId,
+    });
+    final map = data as Map<String, dynamic>;
+    return map['favorited'] as bool? ?? false;
+  }
+
+  Future<List<dynamic>> fetchFavorites() async {
+    final data = await _client.get('/app/favorites');
+    return data as List;
+  }
+
+  Future<void> deleteFavorite(int dramaId) async {
+    await _client.delete('/app/favorites/$dramaId');
+  }
+}