fix(config): use web.AppConfig instead of adapter

- use web.AppConfig, and change related codes

TODO: handles errors

commands/migrate/migrate.go

@@ -21,8 +21,8 @@ import (
 	"fmt"
 	"log"
 
-	"github.com/beego/beego/v2/adapter"
 	"github.com/beego/beego/v2/client/orm"
+	"github.com/beego/beego/v2/server/web"
 	"github.com/mindoc-org/mindoc/models"
 )
 
@@ -114,8 +114,8 @@ func RunMigration() {
 
 //导出数据库的表结构
 func ExportDatabaseTable() ([]string, error) {
-	dbadapter := adapter.AppConfig.String("db_adapter")
-	dbdatabase := adapter.AppConfig.String("db_database")
+	dbadapter,_  := web.AppConfig.String("db_adapter")
+	dbdatabase,_ := web.AppConfig.String("db_database")
 	tables := make([]string, 0)
 
 	o := orm.NewOrm()