refactor(plugins): complete physical encapsulation of auth, admin, message_gateway, and risk_control domain plugins

plugins/domain/message_gateway/push_constants.go

@@ -0,0 +1,15 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package message_gateway
+
+const (
+	channelCustom    = "custom"
+	channelEmail     = "email"
+	channelLark      = "lark"
+	channelTelegram  = "telegram"
+	defaultLevelInfo = "INFO"
+	keyTitle         = "title"
+	keyContent       = "content"
+	keyLevel         = "level"
+)