fix: SocketCreat 0x1D — close后先跑WCHNET回收资源再creat

根因: WCHNET_SocketClose 异步, 资源在 WCHNET_MainTask 中释放.
      tcp_json_restart() close后立刻creat, 旧socket未回收→0x1D.
修复: close后循环5次 WCHNET_MainTask+HandleGlobalInt+Delay(10ms)
      确保资源释放后再 WCHNET_SocketCreat

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c

@@ -803,6 +803,18 @@ void tcp_json_restart(void) {
         g_json_socket_listen = 0xFF;
     }
 
+    /* 1.5 WCHNET 资源回收 — SocketClose 是异步的, 需跑一轮 MainTask */
+    {
+        uint8_t _retry;
+        for (_retry = 0; _retry < 5; _retry++) {
+            WCHNET_MainTask();
+            if (WCHNET_QueryGlobalInt()) {
+                WCHNET_HandleGlobalInt();
+            }
+            Delay_Ms(10);
+        }
+    }
+
     /* 2. 重置状态 */
     g_json_auth_state  = JSON_STATE_WAIT_AUTH;
     g_json_pwd_retry   = 0;