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

internal/config/config.go

@@ -1,14 +1,21 @@
 package config
 
 import (
+	"crypto/rand"
+	"encoding/hex"
 	"os"
+	"path/filepath"
 
 	"gopkg.in/yaml.v3"
 )
 
 type Config struct {
+	DeviceUUID      string   `yaml:"device_uuid"`
 	EdgeID          string   `yaml:"edge_id"`
 	CloudURL        string   `yaml:"cloud_url"`
+	MqttBroker      string   `yaml:"mqtt_broker"`
+	MqttUser        string   `yaml:"mqtt_user"`
+	MqttPass        string   `yaml:"mqtt_pass"`
 	EdgeToken       string   `yaml:"edge_token"`
 	RTSPURLs        []string `yaml:"rtsp_urls"`
 	InferSocket     string   `yaml:"infer_socket"`
@@ -16,12 +23,14 @@ type Config struct {
 	InferWorkers    int      `yaml:"infer_workers"`
 	ConfThreshold   float64  `yaml:"conf_threshold"`
 	DedupWindowSec  int      `yaml:"dedup_window_sec"`
+	OTAUrl          string   `yaml:"ota_url"`
 	Version         string   `yaml:"version"`
+	configPath      string   `json:"-"`
 }
 
 func Load(path string) *Config {
 	cfg := &Config{
-		EdgeID:         "edge-demo-001",
+		EdgeID:         "edge-unknown",
 		CloudURL:       "http://localhost:8004",
 		InferSocket:    "/tmp/edge-infer.sock",
 		InferFPS:       5,
@@ -29,12 +38,15 @@ func Load(path string) *Config {
 		ConfThreshold:  0.5,
 		DedupWindowSec: 30,
 		Version:        "1.0.0",
+		configPath:     path,
 	}
-	data, err := os.ReadFile(path)
-	if err != nil {
-		return cfg
+
+	cfg.loadUUID()
+
+	if data, err := os.ReadFile(path); err == nil {
+		_ = yaml.Unmarshal(data, cfg)
 	}
-	_ = yaml.Unmarshal(data, cfg)
+
 	if cfg.InferWorkers <= 0 {
 		cfg.InferWorkers = 1
 	}
@@ -43,3 +55,31 @@ func Load(path string) *Config {
 	}
 	return cfg
 }
+
+func (c *Config) loadUUID() {
+	uuidPath := "/opt/tianyan-edge/device.uuid"
+	if data, err := os.ReadFile(uuidPath); err == nil {
+		c.DeviceUUID = string(data)
+	} else {
+		b := make([]byte, 16)
+		rand.Read(b)
+		c.DeviceUUID = hex.EncodeToString(b)
+		os.MkdirAll(filepath.Dir(uuidPath), 0755)
+		os.WriteFile(uuidPath, []byte(c.DeviceUUID), 0644)
+	}
+}
+
+func (c *Config) Save() error {
+	data, err := yaml.Marshal(c)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(c.configPath, data, 0644)
+}
+
+func (c *Config) GetDeviceIdentity() string {
+	if c.DeviceUUID != "" {
+		return c.DeviceUUID
+	}
+	return c.EdgeID
+}