同步协议 V1.03：双主题发布对齐 + initialize 数据格式修正

vd960DBN:
- heartbeat/sensor/initialize 发布统一走 dld960/{sn}/dev
- dev_initialize_pub 补 model/hard_ver/soft_ver，删 extra_info.version

DBNMQTTool:
- 协议版本号更新至 V1.03
- 协议 Topic 树和模拟页增加 initialize 支持

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c

@@ -427,12 +427,16 @@ void iot_mqtt_publish_sensor(void) {
 
     snprintf(p, remaining, "]}");
 
-    /* Wrap and publish */
+    /* Wrap and publish — V1.01 双主题模型: dld960/{sn}/dev */
     snprintf(payload, sizeof(payload),
         "{\"msg_id\":%d,\"cmd\":\"loop_data\",\"ts\":%lu,\"data\":%s}",
         ++g_iot_msg_id, mstick() / 1000, data_json);
 
-    mqtt_publish((char *)g_iot_topic.topic_pub, payload, 0);
+    {
+        char topic[IOT_MQTT_TOPIC_MAX_LEN];
+        snprintf(topic, sizeof(topic), "dld960/%s/dev", g_iot_dev_serial);
+        mqtt_publish(topic, payload, 0);
+    }
 
 done:
     InitPkgUart(&g_pkg_uart_2);
@@ -463,7 +467,7 @@ static void iot_send_heartbeat(void) {
         loop_ok[2] ? "true" : "false", loop_ok[3] ? "true" : "false");
 
     char topic[IOT_MQTT_TOPIC_MAX_LEN];
-    iot_make_topic(topic, sizeof(topic), "dev", "status", NULL);
+    snprintf(topic, sizeof(topic), "dld960/%s/dev", g_iot_dev_serial);
     iot_mqtt_publish(topic, payload, strlen(payload), 0);
 }