fix: copy value instead of pointer for metricsHttpIp default

Address review comment to avoid pointer aliasing. Copy the value
instead of the pointer to prevent unexpected side effects if the
bindIp value is modified later.

weed/command/filer.go

@@ -234,7 +234,7 @@ func runFiler(cmd *Command, args []string) bool {
 		}
 		// Set S3 metrics IP based on bind IP if not explicitly set
 		if *filerS3Options.metricsHttpIp == "" {
-			filerS3Options.metricsHttpIp = filerS3Options.bindIp
+			*filerS3Options.metricsHttpIp = *filerS3Options.bindIp
 		}
 		go func(delay time.Duration) {
 			time.Sleep(delay * time.Second)