feat(search): search with meilisearch (#6060)

* feat(search): search with meilisearch.

* feat(search): meilisearch supports auto update.

* chores: remove utils.Log.

* fix(search): the null pointer caused by deleting non-existing file/folder indexes.

---------

Co-authored-by: Andy Hsu <i@nn.ci>

internal/conf/config.go

@@ -1,10 +1,9 @@
 package conf
 
 import (
-	"path/filepath"
-
 	"github.com/alist-org/alist/v3/cmd/flags"
 	"github.com/alist-org/alist/v3/pkg/utils/random"
+	"path/filepath"
 )
 
 type Database struct {
@@ -20,6 +19,12 @@ type Database struct {
 	DSN         string `json:"dsn" env:"DSN"`
 }
 
+type Meilisearch struct {
+	Host        string `json:"host" env:"HOST"`
+	APIKey      string `json:"api_key" env:"API_KEY"`
+	IndexPrefix string `json:"index_prefix" env:"INDEX_PREFIX"`
+}
+
 type Scheme struct {
 	Address      string `json:"address" env:"ADDR"`
 	HttpPort     int    `json:"http_port" env:"HTTP_PORT"`
@@ -65,6 +70,7 @@ type Config struct {
 	JwtSecret             string      `json:"jwt_secret" env:"JWT_SECRET"`
 	TokenExpiresIn        int         `json:"token_expires_in" env:"TOKEN_EXPIRES_IN"`
 	Database              Database    `json:"database" envPrefix:"DB_"`
+	Meilisearch           Meilisearch `json:"meilisearch" env:"MEILISEARCH"`
 	Scheme                Scheme      `json:"scheme"`
 	TempDir               string      `json:"temp_dir" env:"TEMP_DIR"`
 	BleveDir              string      `json:"bleve_dir" env:"BLEVE_DIR"`
@@ -101,6 +107,9 @@ func DefaultConfig() *Config {
 			TablePrefix: "x_",
 			DBFile:      dbPath,
 		},
+		Meilisearch: Meilisearch{
+			Host: "http://localhost:7700",
+		},
 		BleveDir: indexDir,
 		Log: LogConfig{
 			Enable:     true,