fix: Auth timeout 死循环打印 — 改用 do_restart 而非手工 close

根因: WCHNET_SocketClose 后 g_json_socket_listen 未归 0xFF,
      g_json_auth_timer 未重置, 下次 poll 条件仍满足 → 无限打印.
修复: auth timeout 直接 goto do_restart, 走完整的 close→recreate 流程

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c

@@ -1210,14 +1210,11 @@ void tcp_json_poll(void) {
         goto do_restart;
     }
 
-    // Auth timeout check (existing)
+    // Auth timeout — 60s 未完成鉴权 → 重启网络接口
     if (g_json_auth_state == JSON_STATE_WAIT_AUTH) {
         if (mstick() - g_json_auth_timer > TCP_JSON_AUTH_TIMEOUT_MS) {
-            PRINT("JSON: Auth timeout, closing connection\n");
-            WCHNET_SocketClose(g_json_socket_listen, TCP_CLOSE_NORMAL);
-            g_json_auth_state = JSON_STATE_WAIT_AUTH;
-            g_json_pwd_retry = 0;
-            g_json_recv_len = 0;
+            PRINT("JSON: Auth timeout → restart\n");
+            goto do_restart;
         }
     }