feat(chat): 发收消息全量实现 (#25~#28)

- 移除 @riverpod/@freezed 注解依赖，全部改为手写 Provider（无需 build_runner）
  · LoginState 改为纯 Dart，LoginViewModel/ThemeViewModel/ChatViewModel 改为 Notifier
  · UserNotifier 改为 FamilyAsyncNotifier<User?,int>，mini_app_provider 改为手写 Provider
  · 15 个 StreamProvider/StreamProvider.family 从 @riverpod 迁移至手写

- 发送消息（#25）
  · SendMessageRequest/SendMessageResponse DTO
  · SendMessageUseCase：乐观写入 DB → HTTP POST → 更新 Chat 摘要

- 接收消息 WS（#26）
  · WsMessageService：监听 mode2 WS 帧 → HTTP 补拉 → DB 写入 → Chat 更新
  · FetchHistoryRequest/FetchHistoryResponse DTO（GET /app/api/chat/history）
  · FetchHistoryUseCase：拉取 → insertOrReplaceAll

- DI 装配（chat_service_providers.dart）
  · wsMessageServiceProvider、sendMessageUseCaseProvider、fetchHistoryUseCaseProvider

- 聊天列表页（#27）
  · ChatListViewModel（Notifier<void>）+ chat_page.dart 真实会话列表 UI
  · ListTile：头像首字母、最新消息摘要、未读角标、时间格式化

- 聊天详情页（#28）
  · ChatDetailViewModel（FamilyNotifier<ChatDetailState,int>）+ chat_detail_page.dart
  · 消息气泡（自己/他人分左右）、底部输入框、发送状态与错误提示

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/im_app/lib/app/di/api_retry_provider.dart

@@ -3,9 +3,6 @@ import 'package:im_app/app/di/db_provider.dart';
 import 'package:im_app/data/repositories/api_retry_repository_impl.dart';
 import 'package:im_app/domain/entities/api_retry.dart';
 import 'package:im_app/domain/repositories/api_retry_repository.dart';
-import 'package:riverpod_annotation/riverpod_annotation.dart';
-
-part 'api_retry_provider.g.dart';
 
 // ── Repository ────────────────────────────────────────────────────────────────
 
@@ -16,13 +13,11 @@ final apiRetryRepositoryProvider = Provider<ApiRetryRepository>((ref) {
 // ── Streams ───────────────────────────────────────────────────────────────────
 
 /// 监听所有重试任务
-@riverpod
-Stream<List<ApiRetry>> allApiRetries(Ref ref) {
+final allApiRetriesProvider = StreamProvider<List<ApiRetry>>((ref) {
   return ref.watch(apiRetryRepositoryProvider).watchAll();
-}
+});
 
 /// 监听未同步的重试任务
-@riverpod
-Stream<List<ApiRetry>> pendingApiRetries(Ref ref) {
+final pendingApiRetriesProvider = StreamProvider<List<ApiRetry>>((ref) {
   return ref.watch(apiRetryRepositoryProvider).watchPending();
-}
+});

apps/im_app/lib/app/di/sound_provider.dart

@@ -3,9 +3,6 @@ import 'package:im_app/app/di/db_provider.dart';
 import 'package:im_app/data/repositories/sound_repository_impl.dart';
 import 'package:im_app/domain/entities/sound.dart';
 import 'package:im_app/domain/repositories/sound_repository.dart';
-import 'package:riverpod_annotation/riverpod_annotation.dart';
-
-part 'sound_provider.g.dart';
 
 // ── Repository ────────────────────────────────────────────────────────────────
 
@@ -16,19 +13,16 @@ final soundRepositoryProvider = Provider<SoundRepository>((ref) {
 // ── Streams ───────────────────────────────────────────────────────────────────
 
 /// 监听所有音效
-@riverpod
-Stream<List<Sound>> allSounds(Ref ref) {
+final allSoundsProvider = StreamProvider<List<Sound>>((ref) {
   return ref.watch(soundRepositoryProvider).watchAll();
-}
+});
 
 /// 监听指定类型音效
-@riverpod
-Stream<List<Sound>> soundsByType(Ref ref, int typ) {
+final soundsByTypeProvider = StreamProvider.family<List<Sound>, int>((ref, typ) {
   return ref.watch(soundRepositoryProvider).watchByType(typ);
-}
+});
 
 /// 监听指定音效
-@riverpod
-Stream<Sound?> soundById(Ref ref, int id) {
+final soundByIdProvider = StreamProvider.family<Sound?, int>((ref, id) {
   return ref.watch(soundRepositoryProvider).watchById(id);
-}
+});

apps/im_app/lib/app/di/tag_provider.dart

@@ -3,9 +3,6 @@ import 'package:im_app/app/di/db_provider.dart';
 import 'package:im_app/data/repositories/tag_repository_impl.dart';
 import 'package:im_app/domain/entities/tag.dart';
 import 'package:im_app/domain/repositories/tag_repository.dart';
-import 'package:riverpod_annotation/riverpod_annotation.dart';
-
-part 'tag_provider.g.dart';
 
 // ── Repository ────────────────────────────────────────────────────────────────
 
@@ -16,25 +13,21 @@ final tagRepositoryProvider = Provider<TagRepository>((ref) {
 // ── Streams ───────────────────────────────────────────────────────────────────
 
 /// 监听所有标签
-@riverpod
-Stream<List<Tag>> allTags(Ref ref) {
+final allTagsProvider = StreamProvider<List<Tag>>((ref) {
   return ref.watch(tagRepositoryProvider).watchAll();
-}
+});
 
 /// 监听指定 uid 的标签
-@riverpod
-Stream<List<Tag>> tagsByUid(Ref ref, int uid) {
+final tagsByUidProvider = StreamProvider.family<List<Tag>, int>((ref, uid) {
   return ref.watch(tagRepositoryProvider).watchByUid(uid);
-}
+});
 
 /// 监听指定类型的标签
-@riverpod
-Stream<List<Tag>> tagsByType(Ref ref, int type) {
+final tagsByTypeProvider = StreamProvider.family<List<Tag>, int>((ref, type) {
   return ref.watch(tagRepositoryProvider).watchByType(type);
-}
+});
 
 /// 监听指定标签
-@riverpod
-Stream<Tag?> tagById(Ref ref, int id) {
+final tagByIdProvider = StreamProvider.family<Tag?, int>((ref, id) {
   return ref.watch(tagRepositoryProvider).watchById(id);
-}
+});

apps/im_app/lib/app/di/user_provider.dart

@@ -2,20 +2,16 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:im_app/features/chat/usecases/delete_users_use_case.dart';
 import 'package:im_app/features/chat/usecases/insert_users_use_case.dart';
 import 'package:im_app/features/chat/usecases/update_users_use_case.dart';
-import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:im_app/app/di/db_provider.dart';
 import 'package:im_app/data/repositories/user_repository_impl.dart';
 import 'package:im_app/domain/entities/user.dart';
 import 'package:im_app/domain/repositories/user_repository.dart';
 
-part 'user_provider.g.dart';
-
 // ── Repository ────────────────────────────────────────────────────────────────
 
-@riverpod
-UserRepository userRepository(Ref ref) {
+final userRepositoryProvider = Provider<UserRepository>((ref) {
   return UserRepositoryImpl(ref.watch(storageSdkProvider));
-}
+});
 
 // ── Use Cases ─────────────────────────────────────────────────────────────────
 
@@ -42,12 +38,10 @@ final deleteUsersUseCaseProvider = Provider<DeleteUsersUseCase>((ref) {
 
 // ── Streams ───────────────────────────────────────────────────────────────────
 
-@riverpod
-Stream<List<User>> users(Ref ref, Set<int> uids) {
+final usersProvider = StreamProvider.family<List<User>, Set<int>>((ref, uids) {
   return ref.watch(userRepositoryProvider).watchUsers(uids.toList());
-}
+});
 
-@riverpod
-Stream<List<User>> allUsers(Ref ref) {
+final allUsersProvider = StreamProvider<List<User>>((ref) {
   return ref.watch(userRepositoryProvider).watchAllUsers();
-}
+});