refactor(msg_gateway): restructure and rename message_gateway aligned with custom_example

backend/plugins/domain/msg_gateway/model/entity/channel.go

@@ -0,0 +1,56 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package entity defines GORM table mapping entities for msg_gateway.
+package entity
+
+import "time"
+
+// MessageChannel is an admin-configured messaging adapter entity.
+type MessageChannel struct {
+	ID          uint64    `json:"id" gorm:"primaryKey;autoIncrement"`
+	Type        string    `json:"type" gorm:"size:32;not null"`
+	Name        string    `json:"name" gorm:"size:64;not null"`
+	OwnerScope  string    `json:"owner_scope" gorm:"size:32;not null;default:'system'"`
+	OwnerID     *uint64   `json:"owner_id,omitempty"`
+	Credentials string    `json:"credentials" gorm:"type:text;not null"`
+	Extra       string    `json:"extra" gorm:"type:text"`
+	Enabled     bool      `json:"enabled" gorm:"default:false;not null"`
+	CreatedAt   time.Time `json:"created_at" gorm:"autoCreateTime"`
+	UpdatedAt   time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+}
+
+// TableName 表名
+func (MessageChannel) TableName() string {
+	return "w_message_channels"
+}
+
+// MessageBinding maps a platform user to a Wavelet user on one channel.
+type MessageBinding struct {
+	ID             uint64    `json:"id" gorm:"primaryKey;autoIncrement"`
+	ChannelID      uint64    `json:"channel_id" gorm:"not null;index"`
+	PlatformUserID string    `json:"platform_user_id" gorm:"size:128;not null;index"`
+	UserID         uint64    `json:"user_id" gorm:"not null;index"`
+	CreatedAt      time.Time `json:"created_at" gorm:"autoCreateTime"`
+}
+
+// TableName 表名
+func (MessageBinding) TableName() string {
+	return "w_message_bindings"
+}
+
+// MessagePairingCode is a one-time bind code.
+type MessagePairingCode struct {
+	ID             uint64    `json:"id" gorm:"primaryKey;autoIncrement"`
+	Code           string    `json:"code" gorm:"size:32;uniqueIndex;not null"`
+	ChannelID      uint64    `json:"channel_id" gorm:"not null;index"`
+	PlatformUserID string    `json:"platform_user_id" gorm:"size:128;not null;index"`
+	UserID         uint64    `json:"user_id" gorm:"not null;index"`
+	ExpiresAt      time.Time `json:"expires_at" gorm:"not null;index"`
+	CreatedAt      time.Time `json:"created_at" gorm:"autoCreateTime"`
+}
+
+// TableName 表名
+func (MessagePairingCode) TableName() string {
+	return "w_message_pairing_codes"
+}