create project

frontend/lib/providers/family_provider.dart

@@ -0,0 +1,52 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../api/family_api.dart';
+import '../api/api_client.dart';
+import '../models/family.dart';
+
+final familyApiProvider = Provider<FamilyApi>((ref) {
+  return FamilyApi(ref.read(apiClientProvider));
+});
+
+class FamilyNotifier extends StateNotifier<AsyncValue<List<Family>>> {
+  final FamilyApi _api;
+
+  FamilyNotifier(this._api) : super(const AsyncValue.loading());
+
+  Future<void> loadFamilies() async {
+    state = const AsyncValue.loading();
+    try {
+      final res = await _api.getFamilies();
+      if (res['success'] == true) {
+        state = AsyncValue.data((res['data'] as List).map((e) => Family.fromJson(e)).toList());
+      } else {
+        state = AsyncValue.error(res['error'] ?? '加载失败', StackTrace.current);
+      }
+    } catch (e, st) {
+      state = AsyncValue.error(e.toString(), st);
+    }
+  }
+
+  Future<Family?> createFamily(String name) async {
+    try {
+      final res = await _api.createFamily(name);
+      if (res['success'] == true) {
+        return Family.fromJson(res['data']);
+      }
+    } catch (_) {}
+    return null;
+  }
+
+  Future<Family?> joinFamily(String inviteCode) async {
+    try {
+      final res = await _api.joinFamily(inviteCode);
+      if (res['success'] == true) {
+        return Family.fromJson(res['data']);
+      }
+    } catch (_) {}
+    return null;
+  }
+}
+
+final familyProvider = StateNotifierProvider<FamilyNotifier, AsyncValue<List<Family>>>((ref) {
+  return FamilyNotifier(ref.read(familyApiProvider));
+});