feat: V1.03 initialize 上线消息 — 固件+工具同步

vd960DBN:
- dev_initialize_pub() 改为 V1.03 格式 (msg_id/cmd/ts/data/extra_info)
- iot_mqtt_srv: 订阅改双主题 dld960/{sn}/srv, 响应 topic 改 dev
- SUBACK 后自动发 initialize 告知服务器上线
- net_srv.h: 加 dev_initialize_pub 声明

DBNMQTTool:
- protocol.py: 加 CMD_INITIALIZE
- device_manager: DeviceInfo 加 extra_info, 加 mark_online()
- main.py: 接收 initialize 消息, 自动标记设备上线
- docs: 协议 V1.03 + devlog V3.1

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c

@@ -110,23 +110,17 @@ static int iot_mqtt_send_connect(void) {
     return iot_mqtt_send(buf, (uint16_t)len);
 }
 
-/* 发送 MQTT SUBSCRIBE */
+/* 发送 MQTT SUBSCRIBE — V1.01 双主题协议 */
 static int iot_mqtt_send_subscribe(void) {
     static uint8_t buf[256];   // static: 避免栈溢出
     int len;
     char topic[IOT_MQTT_TOPIC_MAX_LEN];
-    MQTTString topics[3];
-    int qos[3] = {1, 1, 1};
+    MQTTString topics[1];
+    int qos[1] = {1};
     int count = 0;
 
-    // 订阅服务器下发消息
-    iot_make_topic(topic, sizeof(topic), "srv", "config", "set");
-    topics[count].cstring = topic; topics[count].lenstring.len = 0; count++;
-
-    iot_make_topic(topic, sizeof(topic), "srv", "config", "query");
-    topics[count].cstring = topic; topics[count].lenstring.len = 0; count++;
-
-    iot_make_topic(topic, sizeof(topic), "srv", "ctrl", NULL);
+    // V1.01: 仅订阅 dld960/{sn}/srv 双主题
+    snprintf(topic, sizeof(topic), "dld960/%s/srv", g_iot_dev_serial);
     topics[count].cstring = topic; topics[count].lenstring.len = 0; count++;
 
     len = MQTTSerialize_subscribe(buf, sizeof(buf), 0,
@@ -192,9 +186,9 @@ static void iot_handle_publish(const char *topic, uint8_t *payload, int payload_
         return;
     }
 
-    /* 构建响应 topic */
+    /* 构建响应 topic — V1.01 双主题 */
     char resp_topic[IOT_MQTT_TOPIC_MAX_LEN];
-    iot_make_topic(resp_topic, sizeof(resp_topic), "dev", "config", "resp");
+    snprintf(resp_topic, sizeof(resp_topic), "dld960/%s/dev", g_iot_dev_serial);
 
     /* 处理命令 — 复用 TCP JSON 的命令逻辑 */
     /* 目前仅实现基本响应框架, 后续逐步对接 Loop MCU 命令 */
@@ -268,6 +262,9 @@ static void iot_handle_suback(void) {
     PRINT("IOT: ← SUBACK, topics subscribed\n");
     g_iot_state = IOT_STATE_READY;
     _iot_reconnect_backoff = 0;  // 连接成功, 重置退避
+
+    // V1.03: 订阅成功后发布 initialize 告知服务器上线
+    dev_initialize_pub();
 }
 
 /* 处理收到的 MQTT 数据 */
@@ -386,10 +383,9 @@ void iot_mqtt_publish_sensor(void) {
         return;
     }
 
-    /* 全通道一次性上报，字段按 DLD960_TCP_JSON协议.md §5.1:
-       ch, freq_level, has_car, loop_ok, freq_current, freq_diff,
-       sensitivity, condition, misc.type, misc.value
-       注意: mqttBuf 需 ≥ 1024 才能容纳 4 通道全字段封包 (~846 字节) */
+    /* 全通道一次性上报，字段按 DLD960_IoT_MQTT协议.md §5.2 V1.02:
+       ch, level, iscar, loop_ok, freq, diff, sens, cndtn, misc.{type,value}
+       注意: mqttBuf 需 ≥ 1024 才能容纳 4 通道全字段封包 (~800 字节) */
     static char data_json[1024];
     static char payload[1400];
     char *p = data_json;