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>

config.example.yml

@@ -36,6 +36,7 @@ outputs:
 
   stdout:
     enabled: false
+    level: INFO  # DEBUG: all logs including orphans, INFO: only correlated, WARN: correlated only, ERROR: none
 
 correlation:
   # Time window for correlation (A and B must be within this window)