feat: add dynamic config reload, unique device identity (UUID), and MQTT support

- New StreamManager for dynamic RTSP/FLV stream lifecycle
- Dynamic worker scaling for inference
- Device UUID generation and persistence
- Telegraf config and NPU monitoring scripts
- .gitignore for build artifacts

config/edge.yaml

@@ -1,13 +1,21 @@
 edge_id: edge-demo-001
 cloud_url: http://101.36.73.102:8004
+mqtt_broker: "tcp://101.36.73.102:1883"
+mqtt_user: ""
+mqtt_pass: ""
 edge_token: ""
 
-# RTSP 流地址（留空使用演示模式）
+# 视频流配置
 rtsp_urls: []
 
+# 推理配置
 infer_socket: /tmp/edge-infer.sock
 infer_fps: 5
 infer_workers: 3
 conf_threshold: 0.5
 dedup_window_sec: 30
-version: 1.0.0
+
+# OTA 配置 (可选: Hawkbit URL 或 Nginx URL)
+ota_url: http://101.36.73.102:8087
+
+version: 1.0.0