Reorganize directory structures

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/handler/handler.go

@@ -0,0 +1,23 @@
+package handler
+
+import (
+	"honoka-chan/config"
+	"honoka-chan/pkg/db"
+
+	"xorm.io/xorm"
+)
+
+var (
+	SifCdnServer string
+	AsCdnServer  string
+	ErrorMsg     = `{"code":20001,"message":""}`
+	MainEng      *xorm.Engine
+	UserEng      *xorm.Engine
+)
+
+func init() {
+	SifCdnServer = config.Conf.Settings.SifCdnServer
+
+	MainEng = db.MainEng
+	UserEng = db.UserEng
+}