初步完成邮件功能

DMS.Infrastructure/Entities/DbEmailMessage.cs

@@ -0,0 +1,86 @@
+using SqlSugar;
+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Infrastructure.Entities
+{
+    /// <summary>
+    /// 邮件消息数据库实体
+    /// </summary>
+    [SugarTable("email_messages")]
+    public class DbEmailMessage
+    {
+        /// <summary>
+        /// 邮件ID
+        /// </summary>
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 关联的邮件账户ID
+        /// </summary>
+        public int EmailAccountId { get; set; }
+
+        /// <summary>
+        /// 发件人邮箱地址
+        /// </summary>
+        [SugarColumn(Length = 255)]
+        public string From { get; set; }
+
+        /// <summary>
+        /// 收件人邮箱地址（多个用分号分隔）
+        /// </summary>
+        [SugarColumn(Length = 1000)]
+        public string To { get; set; }
+
+        /// <summary>
+        /// 抄送邮箱地址（多个用分号分隔）
+        /// </summary>
+        [SugarColumn(Length = 1000, IsNullable = true)]
+        public string? Cc { get; set; }
+
+        /// <summary>
+        /// 密送邮箱地址（多个用分号分隔）
+        /// </summary>
+        [SugarColumn(Length = 1000, IsNullable = true)]
+        public string? Bcc { get; set; }
+
+        /// <summary>
+        /// 邮件主题
+        /// </summary>
+        [SugarColumn(Length = 500)]
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// 邮件正文
+        /// </summary>
+        [SugarColumn(Length = 4000)]
+        public string Body { get; set; }
+
+        /// <summary>
+        /// 是否为HTML格式
+        /// </summary>
+        public bool IsHtml { get; set; } = true;
+
+        /// <summary>
+        /// 邮件发送状态
+        /// </summary>
+        [SugarColumn(Length = 20)]
+        public string Status { get; set; } = "Pending";
+
+        /// <summary>
+        /// 发送时间
+        /// </summary>
+        [SugarColumn(IsNullable = true)]
+        public DateTime? SentAt { get; set; }
+
+        /// <summary>
+        /// 创建时间
+        /// </summary>
+        public DateTime CreatedAt { get; set; } = DateTime.Now;
+
+        /// <summary>
+        /// 更新时间
+        /// </summary>
+        public DateTime UpdatedAt { get; set; } = DateTime.Now;
+    }
+}