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

internal/model/search.go

@@ -0,0 +1,36 @@
+package model
+
+import (
+	"fmt"
+	"time"
+)
+
+type IndexProgress struct {
+	ObjCount     uint64     `json:"obj_count"`
+	IsDone       bool       `json:"is_done"`
+	LastDoneTime *time.Time `json:"last_done_time"`
+	Error        string     `json:"error"`
+}
+
+type SearchReq struct {
+	Parent   string `json:"parent"`
+	Keywords string `json:"keywords"`
+	PageReq
+}
+
+type SearchNode struct {
+	Parent string `json:"parent" gorm:"index"`
+	Name   string `json:"name" gorm:"index"`
+	IsDir  bool   `json:"is_dir"`
+	Size   int64  `json:"size"`
+}
+
+func (p *SearchReq) Validate() error {
+	if p.Page < 1 {
+		return fmt.Errorf("page can't < 1")
+	}
+	if p.PerPage < 1 {
+		return fmt.Errorf("per_page can't < 1")
+	}
+	return nil
+}