feat: implement token-based auto stream pulling

internal/config/config.go

@@ -19,6 +19,10 @@ type Config struct {
 	EdgeToken       string   `yaml:"edge_token"`
 	StreamEnabled   bool     `yaml:"stream_enabled"`
 	RTSPURLs        []string `yaml:"rtsp_urls"`
+	// 新增：自动按需拉流配置
+	StreamPullURL  string `yaml:"stream_pull_url"`  // 云端拉流网关地址
+	StreamProtocol string `yaml:"stream_protocol"`  // 拉流协议: flv, rtsp, ws_flv
+	AutoPull       bool   `yaml:"auto_pull"`        // 是否启用自动按需拉流
 	InferSocket     string   `yaml:"infer_socket"`
 	InferFPS        int      `yaml:"infer_fps"`
 	InferWorkers    int      `yaml:"infer_workers"`