feat: add multi-file type support for Gemini and Claude

- Add file data DTO for structured file handling
- Implement file decoder service
- Update Claude and Gemini relay channels to handle various file types
- Reorganize worker service to cf_worker for clarity
- Update token counter and image service for new file types

service/image.go

@@ -33,12 +33,12 @@ func DecodeBase64ImageData(base64String string) (image.Config, string, string, e
 
 // GetImageFromUrl 获取图片的类型和base64编码的数据
 func GetImageFromUrl(url string) (mimeType string, data string, err error) {
-	resp, err := DoImageRequest(url)
+	resp, err := DoDownloadRequest(url)
 	if err != nil {
-		return
+		return "", "", err
 	}
 	if !strings.HasPrefix(resp.Header.Get("Content-Type"), "image/") {
-		return
+		return "", "", fmt.Errorf("invalid content type: %s, required image/*", resp.Header.Get("Content-Type"))
 	}
 	defer resp.Body.Close()
 	buffer := bytes.NewBuffer(nil)
@@ -52,7 +52,7 @@ func GetImageFromUrl(url string) (mimeType string, data string, err error) {
 }
 
 func DecodeUrlImageData(imageUrl string) (image.Config, string, error) {
-	response, err := DoImageRequest(imageUrl)
+	response, err := DoDownloadRequest(imageUrl)
 	if err != nil {
 		common.SysLog(fmt.Sprintf("fail to get image from url: %s", err.Error()))
 		return image.Config{}, "", err
@@ -64,6 +64,12 @@ func DecodeUrlImageData(imageUrl string) (image.Config, string, error) {
 		return image.Config{}, "", err
 	}
 
+	mimeType := response.Header.Get("Content-Type")
+
+	if !strings.HasPrefix(mimeType, "image/") {
+		return image.Config{}, "", fmt.Errorf("invalid content type: %s, required image/*", mimeType)
+	}
+
 	var readData []byte
 	for _, limit := range []int64{1024 * 8, 1024 * 24, 1024 * 64} {
 		common.SysLog(fmt.Sprintf("try to decode image config with limit: %d", limit))