feat: 扩展领域模型与配置

src/Domain/TakeoutSaaS.Domain/Analytics/Entities/MetricAlertRule.cs

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+using TakeoutSaaS.Domain.Analytics.Enums;
+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Analytics.Entities;
+
+/// <summary>
+/// 指标告警规则。
+/// </summary>
+public sealed class MetricAlertRule : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 关联指标。
+    /// </summary>
+    public Guid MetricDefinitionId { get; set; }
+
+    /// <summary>
+    /// 触发条件 JSON。
+    /// </summary>
+    public string ConditionJson { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 告警级别。
+    /// </summary>
+    public MetricAlertSeverity Severity { get; set; } = MetricAlertSeverity.Warning;
+
+    /// <summary>
+    /// 通知渠道。
+    /// </summary>
+    public string NotificationChannels { get; set; } = "email";
+
+    /// <summary>
+    /// 是否启用。
+    /// </summary>
+    public bool Enabled { get; set; } = true;
+}

src/Domain/TakeoutSaaS.Domain/Analytics/Entities/MetricDefinition.cs

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+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Analytics.Entities;
+
+/// <summary>
+/// 指标定义，描述可观测的数据点。
+/// </summary>
+public sealed class MetricDefinition : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 指标编码。
+    /// </summary>
+    public string Code { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 指标名称。
+    /// </summary>
+    public string Name { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 说明。
+    /// </summary>
+    public string? Description { get; set; }
+
+    /// <summary>
+    /// 维度描述 JSON。
+    /// </summary>
+    public string? DimensionsJson { get; set; }
+
+    /// <summary>
+    /// 默认聚合方式。
+    /// </summary>
+    public string DefaultAggregation { get; set; } = "sum";
+}

src/Domain/TakeoutSaaS.Domain/Analytics/Entities/MetricSnapshot.cs

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+using TakeoutSaaS.Shared.Abstractions.Entities;
+
+namespace TakeoutSaaS.Domain.Analytics.Entities;
+
+/// <summary>
+/// 指标快照，用于大盘展示。
+/// </summary>
+public sealed class MetricSnapshot : MultiTenantEntityBase
+{
+    /// <summary>
+    /// 指标定义 ID。
+    /// </summary>
+    public Guid MetricDefinitionId { get; set; }
+
+    /// <summary>
+    /// 维度键（JSON）。
+    /// </summary>
+    public string DimensionKey { get; set; } = string.Empty;
+
+    /// <summary>
+    /// 统计时间窗口开始。
+    /// </summary>
+    public DateTime WindowStart { get; set; }
+
+    /// <summary>
+    /// 统计时间窗口结束。
+    /// </summary>
+    public DateTime WindowEnd { get; set; }
+
+    /// <summary>
+    /// 数值。
+    /// </summary>
+    public decimal Value { get; set; }
+}

src/Domain/TakeoutSaaS.Domain/Analytics/Enums/MetricAlertSeverity.cs

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+namespace TakeoutSaaS.Domain.Analytics.Enums;
+
+/// <summary>
+/// 指标告警严重程度。
+/// </summary>
+public enum MetricAlertSeverity
+{
+    /// <summary>
+    /// 信息提示。
+    /// </summary>
+    Info = 0,
+
+    /// <summary>
+    /// 告警。
+    /// </summary>
+    Warning = 1,
+
+    /// <summary>
+    /// 严重。
+    /// </summary>
+    Critical = 2
+}