数据和测试案例按照架构来处理

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

@@ -0,0 +1,37 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:im_app/domain/usecases/insert_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) {
+  return UserRepositoryImpl(ref.watch(storageSdkProvider));
+}
+
+// ── Use Cases ─────────────────────────────────────────────────────────────────
+
+/// 批量插入用户用例 Provider
+///
+/// 封装去重 + 分批插入逻辑，ViewModel 只需传入用户列表
+final insertUsersUseCaseProvider = Provider<InsertUsersUseCase>((ref) {
+  return InsertUsersUseCase(userRepository: ref.read(userRepositoryProvider));
+});
+
+// ── Streams ───────────────────────────────────────────────────────────────────
+
+@riverpod
+Stream<List<User>> users(Ref ref, Set<int> uids) {
+  return ref.watch(userRepositoryProvider).watchUsers(uids.toList());
+}
+
+@riverpod
+Stream<List<User>> allUsers(Ref ref) {
+  return ref.watch(userRepositoryProvider).watchAllUsers();
+}