fix(client): 修复启动时 token 刷新导致 Dio adapter closed 崩溃

apiClientProvider 改用 select(isLoggedIn)，token refresh 不触发 provider
重建，避免旧 Dio 被 close 后仍执行 fetch。同时在拦截器内原地更新
_dio.options.headers，保证后续请求使用新 token。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/lib/core/api/api_client.dart

@@ -14,25 +14,21 @@ final _publicDio = Dio(BaseOptions(
 ));
 
 final apiClientProvider = Provider<ApiClient>((ref) {
-  final authState = ref.watch(authStateProvider);
-  final myToken = authState.user?.accessToken;
+  // 只监听登录/登出，不监听 token 内容变化。
+  // token refresh 只改 accessToken，isLoggedIn 不变，provider 不重建，
+  // 避免旧 Dio 被 close 后还在执行 fetch 导致 "adapter was closed"。
+  ref.watch(authStateProvider.select((s) => s.isLoggedIn));
+  final user = ref.read(authStateProvider).user;
 
   final client = ApiClient(
-    token: myToken,
-    refreshToken: authState.user?.refreshToken,
+    token: user?.accessToken,
+    refreshToken: user?.refreshToken,
     onTokenRefreshed: (newToken) {
-      debugPrint('[ApiClient] token refreshed');
-      if (ref.read(authStateProvider).user?.accessToken == myToken) {
-        ref.read(authStateProvider.notifier).updateAccessToken(newToken);
-      }
+      ref.read(authStateProvider.notifier).updateAccessToken(newToken);
     },
     onAuthFailed: () {
-      debugPrint('[ApiClient] onAuthFailed! myToken prefix: ${(myToken ?? '').substring(0, (myToken ?? '').length.clamp(0, 20))}');
-      if (ref.read(authStateProvider).user?.accessToken == myToken) {
-        debugPrint('[ApiClient] calling logout()');
+      if (ref.read(authStateProvider).isLoggedIn) {
         ref.read(authStateProvider.notifier).logout();
-      } else {
-        debugPrint('[ApiClient] skipping logout (stale client)');
       }
     },
   );
@@ -77,8 +73,10 @@ class ApiClient {
                 });
                 final newToken =
                     resp.data['data']['access_token'] as String;
+                // 原地更新 Dio 默认 headers，后续所有请求生效
+                _dio.options.headers['Authorization'] = 'Bearer $newToken';
                 if (!_disposed) onTokenRefreshed?.call(newToken);
-                // 用新 token 重试原请求
+                // 用新 token 重试原请求（此时 _dio 仍存活，不会 adapter closed）
                 final opts = e.requestOptions;
                 opts.headers['Authorization'] = 'Bearer $newToken';
                 final retryResp = await _dio.fetch(opts);