Feat: archive & download routers for test

pkg/filesystem/archive.go

@@ -1 +1,16 @@
 package filesystem
+
+import (
+	"context"
+	"io"
+)
+
+/* ==============
+     压缩/解压缩
+   ==============
+*/
+
+// Compress 创建给定目录和文件的压缩文件
+func (fs *FileSystem) Compress(ctx context.Context, dirs, files []uint) (io.ReadSeeker, error) {
+	return nil, nil
+}