refactor : 用户控制器

lib/modules/auth/controllers/auth_controller.dart

@@ -13,8 +13,8 @@ class AuthController extends GetxController {
   final GetStorage _storage;
 
   // 将 TextEditingController 移动到控制器中，由控制器管理它们的生命周期
-  late final TextEditingController usernameController;
+  late final TextEditingController usernameController = TextEditingController();
-  late final TextEditingController passwordController;
+  late final TextEditingController passwordController = TextEditingController();
 
   final isLoading = false.obs;
   final rememberPassword = false.obs;
@@ -31,20 +31,9 @@ class AuthController extends GetxController {
   @override
   void onInit() {
     super.onInit();
-    // 在 onInit 中初始化控制器
-    usernameController = TextEditingController();
-    passwordController = TextEditingController();
     _loadSavedCredentials();
   }
 
-  @override
-  void onClose() {
-    // 在 onClose 中销毁控制器，防止内存泄漏
-    usernameController.dispose();
-    passwordController.dispose();
-    super.onClose();
-  }
-
   void _loadSavedCredentials() {
     final savedUsername = _storage.read(_usernameKey);
     final savedPassword = _storage.read(_passwordKey);