chore: release client-v1.0.57

设备/状态管理屏（查看本店在线设备/会话，管理员可强制下线）、登录携带设备信息、
会话心跳（/auth/ping）、被踢下线/会话失效提示、顶栏精简 + 用户名移至左侧栏底部。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/core/api/api_client.dart

@@ -33,8 +33,11 @@ final apiClientProvider = Provider<ApiClient>((ref) {
     onTokenRefreshed: (newToken) {
       ref.read(authStateProvider.notifier).updateAccessToken(newToken);
     },
-    onAuthFailed: () {
+    onAuthFailed: (reason) {
       if (ref.read(authStateProvider).isLoggedIn) {
+        if (reason != null) {
+          ref.read(sessionEndedMessageProvider.notifier).state = reason;
+        }
         ref.read(authStateProvider.notifier).logout();
       }
     },
@@ -54,7 +57,7 @@ class ApiClient {
     String? token,
     String? refreshToken,
     void Function(String newToken)? onTokenRefreshed,
-    void Function()? onAuthFailed,
+    void Function(String? reason)? onAuthFailed,
     void Function()? onConnectionError,
   }) {
     _dio = Dio(BaseOptions(
@@ -110,7 +113,14 @@ class ApiClient {
               return handler.resolve(retryResp);
             } catch (refreshErr) {
               debugPrint('[ApiClient] refresh failed: $refreshErr');
-              if (!_disposed) onAuthFailed?.call();
+              // 区分「被踢/会话失效」与普通登录过期，便于登录页给出明确提示
+              String? reason;
+              if (refreshErr is DioException &&
+                  refreshErr.response?.data is Map &&
+                  refreshErr.response?.data['code'] == 'SESSION_REVOKED') {
+                reason = '您的账号已在其他设备登录，或登录已失效，请重新登录';
+              }
+              if (!_disposed) onAuthFailed?.call(reason);
             }
           } else if (e.response?.statusCode == 401) {
             debugPrint('[ApiClient] got 401 on ${e.requestOptions.path}, no refresh token');