fix(resource): 签发本地公开资源直链时追加文件扩展名，并对齐 AutoDL 工作流参数 (#341)

Co-authored-by: Danborad <danborad@github.com>

backend/internal/handler/user_data.go

@@ -312,7 +312,7 @@ func RegisterUserDataRoutes(r *gin.RouterGroup, svc *service.Service) {
 		}
 		c.DataFromReader(stream.StatusCode, stream.ContentLength, resource.MimeType, stream.Body, nil)
 	})
-	r.GET("/public/resources/:id/file", func(c *gin.Context) {
+	publicResourceHandler := func(c *gin.Context) {
 		stream, err := svc.OpenPublicResourceRange(c.Param("id"), c.Query("expires"), c.Query("signature"), c.GetHeader("Range"))
 		if err != nil {
 			failService(c, err)
@@ -336,7 +336,9 @@ func RegisterUserDataRoutes(r *gin.RouterGroup, svc *service.Service) {
 			return
 		}
 		c.DataFromReader(stream.StatusCode, stream.ContentLength, resource.MimeType, stream.Body, nil)
-	})
+	}
+	r.GET("/public/resources/:id/file", publicResourceHandler)
+	r.GET("/public/resources/:id/file/:filename", publicResourceHandler)
 	r.GET("/assets", func(c *gin.Context) {
 		user, err := currentUser(c, svc)
 		if err != nil {