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/AlertStatisticsDtos.cs

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+namespace Model.Dto.Inspection
+{
+    /// <summary>
+    /// 告警趋势统计项（按日/周/月分桶）
+    /// </summary>
+    public class AlertTrendItemDto
+    {
+        /// <summary>时间桶（日:yyyy-MM-dd / 周:yyyy-Www / 月:yyyy-MM）</summary>
+        public string Bucket { get; set; }
+
+        /// <summary>告警总数</summary>
+        public int Total { get; set; }
+
+        /// <summary>信息级数量</summary>
+        public int InfoCount { get; set; }
+
+        /// <summary>警告级数量</summary>
+        public int WarningCount { get; set; }
+
+        /// <summary>紧急级数量</summary>
+        public int UrgentCount { get; set; }
+
+        /// <summary>未闭环数量（未确认+已确认未处理）</summary>
+        public int UnhandledCount { get; set; }
+    }
+
+    /// <summary>
+    /// 告警分布统计项（按设备/类型/级别/来源维度）
+    /// </summary>
+    public class AlertDistributionItemDto
+    {
+        /// <summary>维度名称</summary>
+        public string Name { get; set; }
+
+        /// <summary>数量</summary>
+        public int Count { get; set; }
+    }
+
+    /// <summary>
+    /// 高频告警 TOP 排名项
+    /// </summary>
+    public class AlertTopItemDto
+    {
+        /// <summary>设备编号</summary>
+        public string? DeviceCode { get; set; }
+
+        /// <summary>设备名称</summary>
+        public string? DeviceName { get; set; }
+
+        /// <summary>告警次数（含合并累计 TriggerCount）</summary>
+        public int Count { get; set; }
+
+        /// <summary>最近告警时间</summary>
+        public DateTime LastAlertTime { get; set; }
+    }
+
+    /// <summary>
+    /// 告警处理及时率统计
+    /// </summary>
+    public class AlertTimelinessDto
+    {
+        /// <summary>统计范围内告警总数</summary>
+        public int Total { get; set; }
+
+        /// <summary>已确认数（含已处理/已关闭）</summary>
+        public int AckCount { get; set; }
+
+        /// <summary>已处理/已关闭数</summary>
+        public int HandledCount { get; set; }
+
+        /// <summary>未闭环数</summary>
+        public int UnhandledCount { get; set; }
+
+        /// <summary>平均确认时长（分钟，无确认记录为 null）</summary>
+        public double? AvgAckMinutes { get; set; }
+
+        /// <summary>平均处理时长（分钟，无处理记录为 null）</summary>
+        public double? AvgHandleMinutes { get; set; }
+
+        /// <summary>及时率（%）：30 分钟内确认的占比</summary>
+        public double TimelyRate { get; set; }
+    }
+
+    /// <summary>
+    /// 告警概览统计（列表页顶部卡片）
+    /// </summary>
+    public class AlertOverviewDto
+    {
+        /// <summary>未确认数量</summary>
+        public int UnacknowledgedCount { get; set; }
+
+        /// <summary>今日新增数量</summary>
+        public int TodayCount { get; set; }
+
+        /// <summary>今日紧急数量</summary>
+        public int TodayUrgentCount { get; set; }
+
+        /// <summary>近7日总数</summary>
+        public int WeekCount { get; set; }
+    }
+}