增加站内信未读提醒和后台通知中心+txt 校验

backend/internal/model/notification.go

@@ -17,3 +17,18 @@ type Notification struct {
 func (Notification) TableName() string {
 	return "notifications"
 }
+
+type AdminNotification struct {
+	ID          uint64    `gorm:"primaryKey" json:"id"`
+	AdminUserID uint64    `gorm:"not null;index" json:"admin_user_id"`
+	Type        string    `gorm:"size:32;not null" json:"type"`
+	Title       string    `gorm:"size:128;not null" json:"title"`
+	Content     string    `json:"content"`
+	IsRead      bool      `gorm:"not null;default:false" json:"is_read"`
+	CreatedAt   time.Time `json:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at"`
+}
+
+func (AdminNotification) TableName() string {
+	return "admin_notifications"
+}