feat: optimize database search (#2687)

* feat: remove index on `SearchNode.Name`

As we do not use s% on name column, index there does not work

* fix: init index after init data

Or on the first run, it will log 'init index error: readObjectStart: expect { or n, but found , error found in #0 byte of ...||..., bigger context ...||...'

* fix: match parent more precisely

It will match `/a/bc` if we search in `/a/b` originally.
But it is not backward compatible by adding a suffix `/`
to all the data in parent field

internal/model/search.go

@@ -20,7 +20,7 @@ type SearchReq struct {
 
 type SearchNode struct {
 	Parent string `json:"parent" gorm:"index"`
-	Name   string `json:"name" gorm:"index"`
+	Name   string `json:"name"`
 	IsDir  bool   `json:"is_dir"`
 	Size   int64  `json:"size"`
 }