refactor(file-source): unify file source creation and enhance caching mechanisms

dto/claude.go

@@ -98,6 +98,20 @@ func (c *ClaudeMediaMessage) ParseMediaContent() []ClaudeMediaMessage {
 	return mediaContent
 }
 
+func (m *ClaudeMediaMessage) ToFileSource() types.FileSource {
+	if m.Source == nil {
+		return nil
+	}
+	data := m.Source.Url
+	if data == "" {
+		data = common.Interface2String(m.Source.Data)
+	}
+	if data == "" {
+		return nil
+	}
+	return types.NewFileSourceFromData(data, m.Source.MediaType)
+}
+
 type ClaudeMessageSource struct {
 	Type      string `json:"type"`
 	MediaType string `json:"media_type,omitempty"`
@@ -223,14 +237,6 @@ type OutputConfigForEffort struct {
 	Effort string `json:"effort,omitempty"`
 }
 
-// createClaudeFileSource 根据数据内容创建正确类型的 FileSource
-func createClaudeFileSource(data string) *types.FileSource {
-	if strings.HasPrefix(data, "http://") || strings.HasPrefix(data, "https://") {
-		return types.NewURLFileSource(data)
-	}
-	return types.NewBase64FileSource(data, "")
-}
-
 func (c *ClaudeRequest) GetTokenCountMeta() *types.TokenCountMeta {
 	maxTokens := 0
 	if c.MaxTokens != nil {
@@ -258,17 +264,11 @@ func (c *ClaudeRequest) GetTokenCountMeta() *types.TokenCountMeta {
 				case "text":
 					texts = append(texts, media.GetText())
 				case "image":
-					if media.Source != nil {
-						data := media.Source.Url
-						if data == "" {
-							data = common.Interface2String(media.Source.Data)
-						}
-						if data != "" {
-							fileMeta = append(fileMeta, &types.FileMeta{
-								FileType: types.FileTypeImage,
-								Source:   createClaudeFileSource(data),
-							})
-						}
+					if source := media.ToFileSource(); source != nil {
+						fileMeta = append(fileMeta, &types.FileMeta{
+							FileType: types.FileTypeImage,
+							Source:   source,
+						})
 					}
 				}
 			}
@@ -293,17 +293,11 @@ func (c *ClaudeRequest) GetTokenCountMeta() *types.TokenCountMeta {
 			case "text":
 				texts = append(texts, media.GetText())
 			case "image":
-				if media.Source != nil {
-					data := media.Source.Url
-					if data == "" {
-						data = common.Interface2String(media.Source.Data)
-					}
-					if data != "" {
-						fileMeta = append(fileMeta, &types.FileMeta{
-							FileType: types.FileTypeImage,
-							Source:   createClaudeFileSource(data),
-						})
-					}
+				if source := media.ToFileSource(); source != nil {
+					fileMeta = append(fileMeta, &types.FileMeta{
+						FileType: types.FileTypeImage,
+						Source:   source,
+					})
 				}
 			case "tool_use":
 				if media.Name != "" {