feat(traffic): update progress when caching file (#646)

* feat(traffic): update progress when caching file

* 调整参数位置和命名

---------

Co-authored-by: j2rong4cn <j2rong@qq.com>

internal/model/obj.go

@@ -55,6 +55,19 @@ type FileStreamer interface {
 
 type UpdateProgress func(percentage float64)
 
+func UpdateProgressWithRange(inner UpdateProgress, start, end float64) UpdateProgress {
+	return func(p float64) {
+		if p < 0 {
+			p = 0
+		}
+		if p > 100 {
+			p = 100
+		}
+		scaled := start + (end-start)*(p/100.0)
+		inner(scaled)
+	}
+}
+
 type URL interface {
 	URL() string
 }