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

server/handles/search.go

@@ -0,0 +1,42 @@
+package handles
+
+import (
+	"github.com/alist-org/alist/v3/internal/model"
+	"github.com/alist-org/alist/v3/internal/search"
+	"github.com/alist-org/alist/v3/pkg/utils"
+	"github.com/alist-org/alist/v3/server/common"
+	"github.com/gin-gonic/gin"
+)
+
+type SearchResp struct {
+	model.SearchNode
+	Type int `json:"type"`
+}
+
+func Search(c *gin.Context) {
+	var req model.SearchReq
+	if err := c.ShouldBind(&req); err != nil {
+		common.ErrorResp(c, err, 400)
+		return
+	}
+	if err := req.Validate(); err != nil {
+		common.ErrorResp(c, err, 400)
+		return
+	}
+	nodes, total, err := search.Search(c, req)
+	if err != nil {
+		common.ErrorResp(c, err, 500)
+		return
+	}
+	common.SuccessResp(c, common.PageResp{
+		Content: utils.MustSliceConvert(nodes, nodeToSearchResp),
+		Total:   total,
+	})
+}
+
+func nodeToSearchResp(node model.SearchNode) SearchResp {
+	return SearchResp{
+		SearchNode: node,
+		Type:       utils.GetObjType(node.Name, node.IsDir),
+	}
+}