fix: create socket parent directory on startup

- Create /var/run/logcorrelator/ if missing before binding sockets
- Fixes issue with tmpfs /var/run being cleared on reboot
- Add filepath import for directory handling

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

cmd/logcorrelator/main.go

@@ -95,9 +95,10 @@ func main() {
 	if cfg.Outputs.Stdout.Enabled {
 		stdoutSink := stdout.NewStdoutSink(stdout.Config{
 			Enabled: true,
+			Level:   cfg.Outputs.Stdout.Level,
 		})
 		sinks = append(sinks, stdoutSink)
-		logger.Info("Configured stdout sink")
+		logger.Info(fmt.Sprintf("Configured stdout sink: level=%s", cfg.Outputs.Stdout.Level))
 	}
 
 	// Create multi-sink wrapper