feat(account): 增加账号中心页面与入口

test/account/account_api_test.dart

@@ -13,9 +13,8 @@ void main() {
   String envelope(Object? data, {int code = 0, String message = 'ok'}) =>
       jsonEncode({'code': code, 'message': message, 'data': data});
 
-  AccountApi apiWith(FakeHttpAdapter adapter) => AccountApi(
-    ApiClient(baseUrl: 'http://127.0.0.1:8081', adapter: adapter),
-  );
+  AccountApi apiWith(FakeHttpAdapter adapter) =>
+      AccountApi(ApiClient(baseUrl: 'http://127.0.0.1:8081', adapter: adapter));
 
   test('should_get_profile_and_parse_numeric_vip_level', () async {
     final adapter = FakeHttpAdapter(
@@ -90,11 +89,7 @@ void main() {
             'status': 'active',
             'deleted': 0,
           },
-          {
-            'id': 7,
-            'deviceId': 'd-android-5678',
-            'platform': 'ANDROID',
-          },
+          {'id': 7, 'deviceId': 'd-android-5678', 'platform': 'ANDROID'},
         ]),
       ),
     );
@@ -138,14 +133,10 @@ void main() {
 
   test('should_request_deactivation_with_reason_and_parse_schedule', () async {
     final adapter = FakeHttpAdapter(
-      (_) async => FakeHttpResponse(
-        envelope('2026-11-03T09:30:00'),
-      ),
+      (_) async => FakeHttpResponse(envelope('2026-11-03T09:30:00')),
     );
 
-    final scheduledAt = await apiWith(
-      adapter,
-    ).deactivate(reason: '不再使用');
+    final scheduledAt = await apiWith(adapter).deactivate(reason: '不再使用');
 
     expect(adapter.requests.single.method, 'POST');
     expect(adapter.requests.single.uri.path, '/app/me/deactivate');
@@ -161,18 +152,14 @@ void main() {
     await apiWith(adapter).cancelDeactivation();
 
     expect(adapter.requests.single.method, 'POST');
-    expect(
-      adapter.requests.single.uri.path,
-      '/app/me/deactivate/cancel',
-    );
+    expect(adapter.requests.single.uri.path, '/app/me/deactivate/cancel');
     expect(adapter.requests.single.data, isNull);
   });
 
   test('should_keep_backend_message_when_cancel_fails', () async {
     final adapter = FakeHttpAdapter(
-      (_) async => FakeHttpResponse(
-        envelope(null, code: 100009, message: '没有待处理的注销申请'),
-      ),
+      (_) async =>
+          FakeHttpResponse(envelope(null, code: 100009, message: '没有待处理的注销申请')),
     );
 
     await expectLater(