refactor: centralize logging and update resource initialization

This commit refactors the logging mechanism across the application by replacing direct logger calls with a centralized logging approach using the `common` package. Key changes include:

- Replaced instances of `logger.SysLog` and `logger.FatalLog` with `common.SysLog` and `common.FatalLog` for consistent logging practices.
- Updated resource initialization error handling to utilize the new logging structure, enhancing maintainability and readability.
- Minor adjustments to improve code clarity and organization throughout various modules.

This change aims to streamline logging and improve the overall architecture of the codebase.

relay/helper/valid_request.go

@@ -36,7 +36,7 @@ func GetAndValidateRequest(c *gin.Context, format types.RelayFormat) (request dt
 	case types.RelayFormatOpenAIAudio:
 		request, err = GetAndValidAudioRequest(c, relayMode)
 	case types.RelayFormatOpenAIRealtime:
-	// nothing to do, no request body
+		request = &dto.BaseRequest{}
 	default:
 		return nil, fmt.Errorf("unsupported relay format: %s", format)
 	}