feat: add type to fs read api

internal/conf/const.go

@@ -21,6 +21,8 @@ const (
 	TextTypes     = "text_types"
 	AudioTypes    = "audio_types"
 	VideoTypes    = "video_types"
+	ImageTypes    = "image_types"
+	OfficeTypes   = "office_types"
 	ProxyTypes    = "proxy_types"
 	PdfViewerUrl  = "pdf_viewer_url"
 	AudioAutoplay = "audio_autoplay"
@@ -37,3 +39,13 @@ const (
 
 	Token = "token"
 )
+
+const (
+	UNKNOWN = iota
+	FOLDER
+	OFFICE
+	VIDEO
+	AUDIO
+	TEXT
+	IMAGE
+)