create project

frontend/lib/providers/bill_provider.dart

@@ -0,0 +1,45 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../api/bill_api.dart';
+import '../api/api_client.dart';
+import '../models/bill.dart';
+
+final billApiProvider = Provider<BillApi>((ref) {
+  return BillApi(ref.read(apiClientProvider));
+});
+
+class BillNotifier extends StateNotifier<AsyncValue<List<Bill>>> {
+  final BillApi _api;
+  String? _currentFamilyId;
+
+  BillNotifier(this._api) : super(const AsyncValue.data([]));
+
+  Future<void> loadBills({String? familyId}) async {
+    _currentFamilyId = familyId;
+    state = const AsyncValue.loading();
+    try {
+      final res = await _api.getBills(familyId: familyId);
+      if (res['success'] == true) {
+        state = AsyncValue.data((res['data'] as List).map((e) => Bill.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<bool> addBill(Map<String, dynamic> data) async {
+    try {
+      final res = await _api.createBill(data);
+      if (res['success'] == true) {
+        await loadBills(familyId: _currentFamilyId);
+        return true;
+      }
+    } catch (_) {}
+    return false;
+  }
+}
+
+final billProvider = StateNotifierProvider<BillNotifier, AsyncValue<List<Bill>>>((ref) {
+  return BillNotifier(ref.read(billApiProvider));
+});