feat: multiple search indexes (#2514)

* refactor: abstract search interface

* wip: ~

* fix cycle import

* objs update hook

* wip: ~

* Delete search/none

* auto update index while cache changed

* db searcher

TODO: bleve init issue

cannot open index, metadata missing

* fix size type

why float64??

* fix typo

* fix nil pointer using

* api adapt ui

* bleve: fix clear & change struct

pkg/utils/file.go

@@ -138,6 +138,13 @@ func GetFileType(filename string) int {
 	return conf.UNKNOWN
 }
 
+func GetObjType(filename string, isDir bool) int {
+	if isDir {
+		return conf.FOLDER
+	}
+	return GetFileType(filename)
+}
+
 func GetMimeType(name string) string {
 	ext := path.Ext(name)
 	m := mime.TypeByExtension(ext)