Feat: custom SQLite db file path

pkg/conf/conf.go

@@ -14,6 +14,7 @@ type database struct {
 	Host        string
 	Name        string
 	TablePrefix string
+	DBFile      string
 }
 
 // system 系统通用配置

pkg/conf/defaults.go

@@ -11,7 +11,8 @@ var RedisConfig = &redis{
 
 // DatabaseConfig 数据库配置
 var DatabaseConfig = &database{
-	Type: "UNSET",
+	Type:   "UNSET",
+	DBFile: "cloudreve.db",
 }
 
 // SystemConfig 系统公用配置