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>

internal/config/config.go

@@ -79,7 +79,8 @@ type ClickHouseOutputConfig struct {
 
 // StdoutOutputConfig holds stdout sink configuration.
 type StdoutOutputConfig struct {
-	Enabled bool `yaml:"enabled"`
+	Enabled bool   `yaml:"enabled"`
+	Level   string `yaml:"level"` // DEBUG, INFO, WARN, ERROR - filters output verbosity
 }
 
 // CorrelationConfig holds correlation configuration.