refactor: 优化日历状态管理与首页输入框，添加API客户端抽象

apps/lib/core/api/i_api_client.dart

@@ -0,0 +1,60 @@
+import 'package:dio/dio.dart';
+import 'api_client.dart';
+import 'mock_api_client.dart';
+
+abstract class IApiClient {
+  Future<Response<T>> get<T>(String path, {Options? options});
+  Future<Response<T>> post<T>(String path, {dynamic data, Options? options});
+  Future<Response<T>> patch<T>(String path, {dynamic data, Options? options});
+  Future<Response<T>> delete<T>(String path, {dynamic data, Options? options});
+}
+
+class ApiClientWrapper implements IApiClient {
+  final ApiClient _client;
+
+  ApiClientWrapper(this._client);
+
+  @override
+  Future<Response<T>> get<T>(String path, {Options? options}) =>
+      _client.get(path, options: options);
+
+  @override
+  Future<Response<T>> post<T>(String path, {dynamic data, Options? options}) =>
+      _client.post(path, data: data, options: options);
+
+  @override
+  Future<Response<T>> patch<T>(String path, {dynamic data, Options? options}) =>
+      _client.patch(path, data: data, options: options);
+
+  @override
+  Future<Response<T>> delete<T>(
+    String path, {
+    dynamic data,
+    Options? options,
+  }) => _client.delete(path, data: data, options: options);
+}
+
+class MockApiClientWrapper implements IApiClient {
+  final MockApiClient _client;
+
+  MockApiClientWrapper(this._client);
+
+  @override
+  Future<Response<T>> get<T>(String path, {Options? options}) =>
+      _client.get(path, options: options);
+
+  @override
+  Future<Response<T>> post<T>(String path, {dynamic data, Options? options}) =>
+      _client.post(path, data: data, options: options);
+
+  @override
+  Future<Response<T>> patch<T>(String path, {dynamic data, Options? options}) =>
+      _client.patch(path, data: data, options: options);
+
+  @override
+  Future<Response<T>> delete<T>(
+    String path, {
+    dynamic data,
+    Options? options,
+  }) => _client.delete(path, data: data, options: options);
+}

apps/lib/core/api/mock_api_client.dart

@@ -0,0 +1,87 @@
+import 'package:dio/dio.dart';
+
+class MockApiClient {
+  final Map<String, _MockHandler> _handlers = {};
+
+  void registerHandler(String path, String method, _MockHandler handler) {
+    final key = '$path:$method';
+    _handlers[key] = handler;
+  }
+
+  void clearMocks() {
+    _handlers.clear();
+  }
+
+  Future<Response<T>> get<T>(String path, {Options? options}) async {
+    return _handleRequest('GET', path, options: options);
+  }
+
+  Future<Response<T>> post<T>(
+    String path, {
+    dynamic data,
+    Options? options,
+  }) async {
+    return _handleRequest('POST', path, data: data, options: options);
+  }
+
+  Future<Response<T>> patch<T>(
+    String path, {
+    dynamic data,
+    Options? options,
+  }) async {
+    return _handleRequest('PATCH', path, data: data, options: options);
+  }
+
+  Future<Response<T>> delete<T>(
+    String path, {
+    dynamic data,
+    Options? options,
+  }) async {
+    return _handleRequest('DELETE', path, data: data, options: options);
+  }
+
+  Future<Response<T>> _handleRequest<T>(
+    String method,
+    String path, {
+    dynamic data,
+    Options? options,
+  }) async {
+    await Future.delayed(const Duration(milliseconds: 200));
+
+    final key = '$path:$method';
+    final handler = _handlers[key];
+
+    if (handler != null) {
+      final response = handler(data);
+      if (response is Response) {
+        return response as Response<T>;
+      }
+      return Response<T>(
+        data: response as T?,
+        statusCode: 200,
+        requestOptions: RequestOptions(path: path),
+      );
+    }
+
+    return Response<T>(
+      data: null,
+      statusCode: 404,
+      requestOptions: RequestOptions(path: path),
+    );
+  }
+}
+
+typedef _MockHandler = dynamic Function(dynamic data);
+
+class MockApiClientHolder {
+  static MockApiClient? _instance;
+
+  static MockApiClient get instance {
+    _instance ??= MockApiClient();
+    return _instance!;
+  }
+
+  static void reset() {
+    _instance = null;
+  }
+}