fix(vd960DBN): UART2 粘帧/checksum fail — 高频打印关中断丢字节 + flag 不清

现场: LUP 帧后 checksum fail 刷屏 (坏帧: 7F 03 39 EF... 多帧拼接)。
根因链条:
1. LUP Rx 打印 190B @256000 = 7.4ms 关中断 (PRINT 临界区)
   → UART2(19200) RX 溢出丢字节 → 帧解析错位 → 粘帧
2. g_pkg_uart_2.flag 清理缺失: uart_srv 0xC0 分支不 InitPkgUart,
   tcp_json_push_sensor not authed 提前 return 也不清
   → 坏帧反复处理 → checksum fail 刷屏

修复:
- LUP Rx 打印 #if 0 (高频打印关中断是丢字节根因, 调试时开)
- json_sensor_callback not authed 打印 #if 0 (每帧刷屏)
- uart_srv 所有分支消费后统一 InitPkgUart (0xC0 + 非0xC0无BLE)
- 顺带修 report disabled 双反斜杠

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/loop_uart_proto.c

@@ -687,7 +687,10 @@ void lup_process_frame(const uint8_t *pkg, uint16_t len)
     if (len < 6) { FAULT_MARKER(MK_LUP_FRAME_OUT); return; }
 
     // Debug: print raw (2026-08-13: 缓冲一次性输出 — 逐字节 PRINT 关中断 ~350us/字节
-    // 会屏蔽 UART2 ISR 丢帧, 且高频打印放大 printf 重入窗口)
+    // 会屏蔽 UART2 ISR 丢帧, 且高频打印放大 printf 重入窗口。
+    // 再关闭: 190B 打印 @256000 = 7.4ms 关中断 → UART2(19200) 溢出丢字节 → 粘帧!
+    // 需要调试时打开 #if 1)
+#if 0
     {
         char _hex[224];
         int _p = snprintf(_hex, sizeof(_hex), "LUP Rx:");
@@ -696,6 +699,7 @@ void lup_process_frame(const uint8_t *pkg, uint16_t len)
         }
         PRINT("%s\n", _hex);
     }
+#endif
 
     // --- Checksum ---
     csr = lup_verify_checksum(pkg, len);

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c

@@ -883,8 +883,13 @@ static void json_sensor_callback(const uint8_t *pkg, uint16_t len)
 
     // Check: socket active, authed, report enabled
     if (g_json_socket_listen == 0xFF) { PRINT("JSON: sensor_cb skip: no socket\n"); return; }
+    /* 2026-08-13: not authed 每帧打印太吵 (Loop MCU 高频上报), 且占用主循环
+       关中断窗口 → UART2 丢字节。调试时打开 */
+#if 0
     if (g_json_auth_state != JSON_STATE_AUTHED) { PRINT("JSON: sensor_cb skip: not authed\n"); return; }
-    if (!g_report_cfg.enable) { PRINT("JSON: sensor_cb skip: report disabled\\n"); return; }
+#endif
+    if (g_json_auth_state != JSON_STATE_AUTHED) { return; }
+    if (!g_report_cfg.enable) { PRINT("JSON: sensor_cb skip: report disabled\n"); return; }
 
     LUP_SensorReport sr;
     memset(&sr, 0, sizeof(sr));

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/usart_biz.c

@@ -174,13 +174,20 @@ void uart_srv(void)
                         g_pkg_uart_2.pkg[0] = 0x8F;
                         g_flag_notify_temp = set_response_tran_to_notify(g_pkg_uart_2.pkg, g_pkg_uart_2.offset, &g_notify_buftemp);  // 保留给 BLE
                     }
-                    // else: 回调已推送 TCP，直接清理
+                    /* 2026-08-13 修复: 0xC0 帧消费后必须清 flag —
+                       原缺失, auth 未通过时 tcp_json_push_sensor 提前 return
+                       也不清 → 坏帧/正常帧反复处理 (checksum fail 刷屏) */
+                    InitPkgUart(&g_pkg_uart_2);
                 }
                 else {
                     if(g_flag_bt_state){
                         g_flag_notify_temp = set_response_tran_to_notify(g_pkg_uart_2.pkg, g_pkg_uart_2.offset, &g_notify_buftemp);
                         InitPkgUart(&g_pkg_uart_2);
                     }
+                    else {
+                        /* 2026-08-13 修复: 非 0xC0 + 无 BLE 连接也清 flag (原缺失) */
+                        InitPkgUart(&g_pkg_uart_2);
+                    }                    
                 }
 
                 // 调试打印 (2026-08-13: LUP Rx 已在 lup_process_frame 缓冲打印,