Refine handling of POST /api/v1/datasets/search in GO (#15583)

### What problem does this PR solve?

Refine handling of POST /api/v1/datasets/search in GO

### Type of change

- [x] Refactoring

cmd/ragflow_cli.go

@@ -39,7 +39,7 @@ func main() {
 	if args.Verbose {
 		logLevel = "info"
 	}
-	if err = common.Init(logLevel); err != nil {
+	if err = common.Init(logLevel, ""); err != nil {
 		fmt.Printf("Warning: Failed to initialize logger: %v\n", err)
 	}