fix anwser token and database issus

internal/storage/s3.go

@@ -109,24 +109,22 @@ func uploadPictureToS3(file multipart.File, fileHeader *multipart.FileHeader, as
 		return "", errors.Wrap(err, "reset reader")
 	}
 
-	// 4. 根据格式进行转换或直接使用原图
+	// 4. 按格式转换或直接使用原图
 	switch format {
 	case "gif":
 		webpData, err := convertGifToAnimatedWebP(fileData)
 		if err != nil {
-			// 转换失败则回退到原始 GIF
-			uploadData = fileData
+			uploadData = fileData // 转换失败回退原始 GIF
 			contentType = "image/gif"
 		} else {
 			uploadData = webpData
 			contentType = "image/webp"
 		}
 	default:
-		// 静态图片（JPEG / PNG / WebP 等）转换为静态 WebP
+		// 静态图片（JPEG / PNG / WebP 等）转静态 WebP
 		webpData, err := ConvertStaticImageToWebP(fileReader)
 		if err != nil {
-			// 转换失败时回退到原始图片
-			uploadData = fileData
+			uploadData = fileData // 转换失败回退原图
 			contentType = mimeTypeFromFormat(format)
 		} else {
 			uploadData = webpData