create project

frontend/lib/api/family_api.dart

@@ -0,0 +1,26 @@
+import 'api_client.dart';
+
+class FamilyApi {
+  final ApiClient _client;
+  FamilyApi(this._client);
+
+  Future<Map<String, dynamic>> getFamilies() {
+    return _client.get('/families');
+  }
+
+  Future<Map<String, dynamic>> getFamily(String id) {
+    return _client.get('/families/$id');
+  }
+
+  Future<Map<String, dynamic>> createFamily(String name) {
+    return _client.post('/families', data: {'name': name});
+  }
+
+  Future<Map<String, dynamic>> joinFamily(String inviteCode) {
+    return _client.post('/families/join', data: {'inviteCode': inviteCode});
+  }
+
+  Future<Map<String, dynamic>> leaveFamily(String familyId) {
+    return _client.post('/families/leave', data: {'familyId': familyId});
+  }
+}