搭建消息告警模块以及跨网推送服务，支持企微，飞书，钉钉通知

Model/Dto/Inspection/AlertOutboxDtos.cs

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+namespace Model.Dto.Inspection
+{
+    /// <summary>
+    /// 跨网发件箱拉取结果 DTO（AlertBridge 拉取到的待推送项；Payload 自包含全部推送要素）
+    /// </summary>
+    public class AlertOutboxItemDto
+    {
+        /// <summary>发件箱 Id（回写结果时使用）</summary>
+        public string? Id { get; set; }
+
+        /// <summary>告警消息Id</summary>
+        public string? AlertId { get; set; }
+
+        /// <summary>渠道Id</summary>
+        public string? ChannelId { get; set; }
+
+        /// <summary>完整推送报文 JSON（AlertOutboxPayload 序列化）</summary>
+        public string? Payload { get; set; }
+
+        /// <summary>重试次数</summary>
+        public int RetryCount { get; set; }
+    }
+
+    /// <summary>
+    /// 发件箱推送报文（自包含：AlertBridge 无需访问数据库/配置即可推送）
+    /// </summary>
+    public class AlertOutboxPayload
+    {
+        /// <summary>渠道类型（1飞书/2钉钉/3企微）</summary>
+        public int ChannelType { get; set; }
+
+        /// <summary>Webhook 地址</summary>
+        public string? WebhookUrl { get; set; }
+
+        /// <summary>加签密钥（可空）</summary>
+        public string? Secret { get; set; }
+
+        /// <summary>消息标题</summary>
+        public string? Title { get; set; }
+
+        /// <summary>消息正文（markdown）</summary>
+        public string? Content { get; set; }
+
+        /// <summary>@ 手机号列表</summary>
+        public List<string>? AtMobiles { get; set; }
+    }
+
+    /// <summary>
+    /// 发件箱结果回写 DTO（AlertBridge 推送完成后回写）
+    /// </summary>
+    public class OutboxResultDto
+    {
+        /// <summary>是否成功</summary>
+        public bool Success { get; set; }
+
+        /// <summary>结果信息（失败原因）</summary>
+        public string? ResultMsg { get; set; }
+    }
+}