初步添加报警功能

DMS.Core/Enums/AlarmRule.cs

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+namespace DMS.Core.Enums
+{
+    public enum AlarmRule
+    {
+        /// <summary>
+        /// 超过上限报警
+        /// </summary>
+        AboveMax,
+        
+        /// <summary>
+        /// 低于下限报警
+        /// </summary>
+        BelowMin,
+        
+        /// <summary>
+        /// 超出范围报警（同时检查上限和下限）
+        /// </summary>
+        OutOfRange,
+        
+        /// <summary>
+        /// 死区报警
+        /// </summary>
+        Deadband,
+        
+        /// <summary>
+        /// 布尔值变化报警
+        /// </summary>
+        BooleanChange
+    }
+}

DMS.Core/Events/AlarmEventArgs.cs

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+using System;
+
+namespace DMS.Core.Events
+{
+    public class AlarmEventArgs : EventArgs
+    {
+        public int VariableId { get; }
+        public string VariableName { get; }
+        public double CurrentValue { get; }
+        public double ThresholdValue { get; }
+        public string Message { get; }
+        public DateTime Timestamp { get; }
+        public string AlarmType { get; } // 可以是 "High", "Low", "Change" 等
+
+        public AlarmEventArgs(int variableId, string variableName, double currentValue, 
+                              double thresholdValue, string message, string alarmType)
+        {
+            VariableId = variableId;
+            VariableName = variableName;
+            CurrentValue = currentValue;
+            ThresholdValue = thresholdValue;
+            Message = message;
+            Timestamp = DateTime.Now;
+            AlarmType = alarmType;
+        }
+    }
+}

DMS.Core/Interfaces/Repositories/IAlarmHistoryRepository.cs

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+using DMS.Core.Models;
+
+namespace DMS.Core.Interfaces.Repositories
+{
+    /// <summary>
+    /// 报警历史记录仓库接口
+    /// </summary>
+    public interface IAlarmHistoryRepository : IBaseRepository<AlarmHistory>
+    {
+        // 可以添加特定于报警历史记录的查询方法
+        // 例如：
+        // Task<IEnumerable<AlarmHistory>> GetUnacknowledgedAlarmsAsync();
+        // Task<IEnumerable<AlarmHistory>> GetAlarmsByVariableIdAsync(int variableId);
+        // Task AcknowledgeAlarmAsync(int alarmId, string acknowledgedBy);
+    }
+}

DMS.Core/Models/AlarmHistory.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace DMS.Core.Models
+{
+    /// <summary>
+    /// 报警历史记录实体
+    /// </summary>
+    public class AlarmHistory
+    {
+        /// <summary>
+        /// 主键ID
+        /// </summary>
+        [Key]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 变量ID
+        /// </summary>
+        public int VariableId { get; set; }
+
+        /// <summary>
+        /// 变量名称
+        /// </summary>
+        [MaxLength(100)]
+        public string VariableName { get; set; }
+
+        /// <summary>
+        /// 当前值
+        /// </summary>
+        public double CurrentValue { get; set; }
+
+        /// <summary>
+        /// 阈值
+        /// </summary>
+        public double ThresholdValue { get; set; }
+
+        /// <summary>
+        /// 报警类型 (High, Low, Deadband, BooleanChange)
+        /// </summary>
+        [MaxLength(50)]
+        public string AlarmType { get; set; }
+
+        /// <summary>
+        /// 报警消息
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <summary>
+        /// 报警触发时间
+        /// </summary>
+        public DateTime Timestamp { get; set; }
+
+        /// <summary>
+        /// 是否已确认
+        /// </summary>
+        public bool IsAcknowledged { get; set; }
+
+        /// <summary>
+        /// 确认时间
+        /// </summary>
+        public DateTime? AcknowledgedAt { get; set; }
+
+        /// <summary>
+        /// 确认人
+        /// </summary>
+        [MaxLength(100)]
+        public string AcknowledgedBy { get; set; }
+    }
+}