feat: add stream_enabled config to control ffmpeg pulling and optimize infer startup script

internal/stream/ingestor.go

@@ -64,6 +64,23 @@ func (sm *StreamManager) applyStreams(ctx context.Context, urls []string, fps in
 	sm.mu.Lock()
 	defer sm.mu.Unlock()
 
+	// Stream enabled check
+	enabled := true
+	if sm.cfg != nil && !sm.cfg.StreamEnabled {
+		enabled = false
+	}
+
+	// If disabled, stop all streams and return
+	if !enabled {
+		log.Println("stream: disabled by config, stopping all")
+		for url, sp := range sm.processes {
+			log.Printf("stream: stopping %s", url)
+			sm.stopProcess(sp)
+			delete(sm.processes, url)
+		}
+		return
+	}
+
 	// Identify URLs to remove (present in sm.processes but not in new urls)
 	toRemove := map[string]*streamProcess{}
 	for url, sp := range sm.processes {