初步完成邮件功能

DMS.Infrastructure/Entities/DbEmailTemplate.cs

@@ -0,0 +1,62 @@
+using SqlSugar;
+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Infrastructure.Entities
+{
+    /// <summary>
+    /// 邮件模板数据库实体
+    /// </summary>
+    [SugarTable("email_templates")]
+    public class DbEmailTemplate
+    {
+        /// <summary>
+        /// 模板ID
+        /// </summary>
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 模板名称
+        /// </summary>
+        [SugarColumn(Length = 100)]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// 模板代码（唯一标识）
+        /// </summary>
+        [SugarColumn(Length = 50)]
+        public string Code { get; set; }
+
+        /// <summary>
+        /// 模板主题
+        /// </summary>
+        [SugarColumn(Length = 500)]
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// 模板内容
+        /// </summary>
+        [SugarColumn(Length = 4000)]
+        public string Body { get; set; }
+
+        /// <summary>
+        /// 是否为HTML格式
+        /// </summary>
+        public bool IsHtml { get; set; } = true;
+
+        /// <summary>
+        /// 是否启用
+        /// </summary>
+        public bool IsActive { get; set; } = true;
+
+        /// <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;
+    }
+}