初步完成邮件功能

DMS.Infrastructure/Entities/DbEmailAccount.cs

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+using SqlSugar;
+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Infrastructure.Entities
+{
+    /// <summary>
+    /// 邮件账户数据库实体
+    /// </summary>
+    [SugarTable("email_accounts")]
+    public class DbEmailAccount
+    {
+        /// <summary>
+        /// 账户ID
+        /// </summary>
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 账户名称
+        /// </summary>
+        [SugarColumn(Length = 100)]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// 邮箱地址
+        /// </summary>
+        [SugarColumn(Length = 255)]
+        public string EmailAddress { get; set; }
+
+        /// <summary>
+        /// SMTP服务器地址
+        /// </summary>
+        [SugarColumn(Length = 100)]
+        public string SmtpServer { get; set; }
+
+        /// <summary>
+        /// SMTP端口号
+        /// </summary>
+        public int SmtpPort { get; set; } = 587;
+
+        /// <summary>
+        /// 是否启用SSL
+        /// </summary>
+        public bool EnableSsl { get; set; } = true;
+
+        /// <summary>
+        /// 用户名
+        /// </summary>
+        [SugarColumn(Length = 100)]
+        public string Username { get; set; }
+
+        /// <summary>
+        /// 密码
+        /// </summary>
+        [SugarColumn(Length = 100)]
+        public string Password { get; set; }
+
+        /// <summary>
+        /// IMAP服务器地址
+        /// </summary>
+        [SugarColumn(Length = 100, IsNullable = true)]
+        public string? ImapServer { get; set; }
+
+        /// <summary>
+        /// IMAP端口号
+        /// </summary>
+        public int ImapPort { get; set; } = 993;
+
+        /// <summary>
+        /// 是否为默认账户
+        /// </summary>
+        public bool IsDefault { get; set; }
+
+        /// <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;
+    }
+}

DMS.Infrastructure/Entities/DbEmailLog.cs

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+using SqlSugar;
+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Infrastructure.Entities
+{
+    /// <summary>
+    /// 邮件日志数据库实体
+    /// </summary>
+    [SugarTable("email_logs")]
+    public class DbEmailLog
+    {
+        /// <summary>
+        /// 日志ID
+        /// </summary>
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 关联的邮件ID
+        /// </summary>
+        public int EmailMessageId { get; set; }
+
+        /// <summary>
+        /// 日志级别
+        /// </summary>
+        [SugarColumn(Length = 20)]
+        public string Level { get; set; }
+
+        /// <summary>
+        /// 日志消息
+        /// </summary>
+        [SugarColumn(Length = 4000)]
+        public string Message { get; set; }
+
+        /// <summary>
+        /// 异常详情
+        /// </summary>
+        [SugarColumn(Length = 2000, IsNullable = true)]
+        public string? Exception { get; set; }
+
+        /// <summary>
+        /// 创建时间
+        /// </summary>
+        public DateTime CreatedAt { get; set; } = DateTime.Now;
+    }
+}

DMS.Infrastructure/Entities/DbEmailMessage.cs

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+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;
+    }
+}

DMS.Infrastructure/Entities/DbEmailTemplate.cs

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+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;
+    }
+}