初步完成邮件功能

DMS.Core/Interfaces/Repositories/IEmailAccountRepository.cs

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+using DMS.Core.Models;
+
+namespace DMS.Core.Interfaces.Repositories
+{
+    /// <summary>
+    /// 邮件账户仓储接口
+    /// </summary>
+    public interface IEmailAccountRepository : IBaseRepository<EmailAccount>
+    {
+        /// <summary>
+        /// 获取默认邮件账户
+        /// </summary>
+        Task<EmailAccount> GetDefaultAccountAsync();
+
+        /// <summary>
+        /// 获取所有启用的邮件账户
+        /// </summary>
+        Task<List<EmailAccount>> GetActiveAccountsAsync();
+    }
+}

DMS.Core/Interfaces/Repositories/IEmailLogRepository.cs

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+using DMS.Core.Models;
+
+namespace DMS.Core.Interfaces.Repositories
+{
+    /// <summary>
+    /// 邮件日志仓储接口
+    /// </summary>
+    public interface IEmailLogRepository : IBaseRepository<EmailLog>
+    {
+        /// <summary>
+        /// 根据邮件消息ID获取日志
+        /// </summary>
+        Task<List<EmailLog>> GetByEmailMessageIdAsync(int emailMessageId);
+
+        /// <summary>
+        /// 根据日期范围获取日志
+        /// </summary>
+        Task<List<EmailLog>> GetByDateRangeAsync(DateTime startDate, DateTime endDate);
+    }
+}

DMS.Core/Interfaces/Repositories/IEmailMessageRepository.cs

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+using DMS.Core.Models;
+
+namespace DMS.Core.Interfaces.Repositories
+{
+    /// <summary>
+    /// 邮件消息仓储接口
+    /// </summary>
+    public interface IEmailMessageRepository : IBaseRepository<EmailMessage>
+    {
+        /// <summary>
+        /// 根据状态获取邮件消息
+        /// </summary>
+        Task<List<EmailMessage>> GetByStatusAsync(EmailSendStatus status);
+
+        /// <summary>
+        /// 获取指定时间范围内的邮件消息
+        /// </summary>
+        Task<List<EmailMessage>> GetByDateRangeAsync(DateTime startDate, DateTime endDate);
+    }
+}

DMS.Core/Interfaces/Repositories/IEmailTemplateRepository.cs

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+using DMS.Core.Models;
+
+namespace DMS.Core.Interfaces.Repositories
+{
+    /// <summary>
+    /// 邮件模板仓储接口
+    /// </summary>
+    public interface IEmailTemplateRepository : IBaseRepository<EmailTemplate>
+    {
+        /// <summary>
+        /// 根据代码获取邮件模板
+        /// </summary>
+        Task<EmailTemplate> GetByCodeAsync(string code);
+
+        /// <summary>
+        /// 获取所有启用的邮件模板
+        /// </summary>
+        Task<List<EmailTemplate>> GetActiveTemplatesAsync();
+    }
+}

DMS.Core/Interfaces/Services/IEmailService.cs

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+using DMS.Core.Models;
+
+namespace DMS.Core.Interfaces.Services
+{
+    /// <summary>
+    /// 邮件服务接口
+    /// </summary>
+    public interface IEmailService
+    {
+        /// <summary>
+        /// 异步发送邮件
+        /// </summary>
+        /// <param name="message">邮件消息</param>
+        /// <param name="account">邮件账户</param>
+        /// <returns>发送是否成功</returns>
+        Task<bool> SendEmailAsync(EmailMessage message, EmailAccount account);
+
+        /// <summary>
+        /// 异步接收邮件
+        /// </summary>
+        /// <param name="account">邮件账户</param>
+        /// <param name="count">接收邮件数量</param>
+        /// <returns>接收到的邮件列表</returns>
+        Task<List<EmailMessage>> ReceiveEmailsAsync(EmailAccount account, int count = 10);
+
+        /// <summary>
+        /// 测试邮件账户连接
+        /// </summary>
+        /// <param name="account">邮件账户</param>
+        /// <returns>连接是否成功</returns>
+        Task<bool> TestConnectionAsync(EmailAccount account);
+    }
+}

DMS.Core/Models/EmailAccount.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Core.Models
+{
+    /// <summary>
+    /// 邮件账户配置实体
+    /// </summary>
+    public class EmailAccount
+    {
+        /// <summary>
+        /// 账户ID
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 账户名称
+        /// </summary>
+        [Required]
+        [MaxLength(100)]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// 邮箱地址
+        /// </summary>
+        [Required]
+        [MaxLength(255)]
+        public string EmailAddress { get; set; }
+
+        /// <summary>
+        /// SMTP服务器地址
+        /// </summary>
+        [Required]
+        [MaxLength(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>
+        [Required]
+        [MaxLength(100)]
+        public string Username { get; set; }
+
+        /// <summary>
+        /// 密码
+        /// </summary>
+        [Required]
+        [MaxLength(100)]
+        public string Password { get; set; }
+
+        /// <summary>
+        /// IMAP服务器地址
+        /// </summary>
+        [MaxLength(100)]
+        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.Core/Models/EmailLog.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Core.Models
+{
+    /// <summary>
+    /// 邮件日志实体
+    /// </summary>
+    public class EmailLog
+    {
+        /// <summary>
+        /// 日志ID
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 关联的邮件ID
+        /// </summary>
+        public int EmailMessageId { get; set; }
+
+        /// <summary>
+        /// 日志级别
+        /// </summary>
+        [Required]
+        [MaxLength(20)]
+        public string Level { get; set; }
+
+        /// <summary>
+        /// 日志消息
+        /// </summary>
+        [Required]
+        public string Message { get; set; }
+
+        /// <summary>
+        /// 异常详情
+        /// </summary>
+        public string? Exception { get; set; }
+
+        /// <summary>
+        /// 创建时间
+        /// </summary>
+        public DateTime CreatedAt { get; set; } = DateTime.Now;
+    }
+}

DMS.Core/Models/EmailMessage.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Core.Models
+{
+    /// <summary>
+    /// 邮件消息实体
+    /// </summary>
+    public class EmailMessage
+    {
+        /// <summary>
+        /// 邮件ID
+        /// </summary>
+        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>
+        [Required]
+        [MaxLength(255)]
+        public string From { get; set; }
+
+        /// <summary>
+        /// 收件人邮箱地址（多个用分号分隔）
+        /// </summary>
+        [Required]
+        [MaxLength(1000)]
+        public string To { get; set; }
+
+        /// <summary>
+        /// 抄送邮箱地址（多个用分号分隔）
+        /// </summary>
+        [MaxLength(1000)]
+        public string? Cc { get; set; }
+
+        /// <summary>
+        /// 密送邮箱地址（多个用分号分隔）
+        /// </summary>
+        [MaxLength(1000)]
+        public string? Bcc { get; set; }
+
+        /// <summary>
+        /// 邮件主题
+        /// </summary>
+        [Required]
+        [MaxLength(500)]
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// 邮件正文
+        /// </summary>
+        [Required]
+        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>
+        public EmailSendStatus Status { get; set; } = EmailSendStatus.Pending;
+
+        /// <summary>
+        /// 发送时间
+        /// </summary>
+        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;
+    }
+
+    /// <summary>
+    /// 邮件发送状态枚举
+    /// </summary>
+    public enum EmailSendStatus
+    {
+        /// <summary>
+        /// 待发送
+        /// </summary>
+        Pending,
+
+        /// <summary>
+        /// 发送成功
+        /// </summary>
+        Sent,
+
+        /// <summary>
+        /// 发送失败
+        /// </summary>
+        Failed
+    }
+}

DMS.Core/Models/EmailTemplate.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace DMS.Core.Models
+{
+    /// <summary>
+    /// 邮件模板实体
+    /// </summary>
+    public class EmailTemplate
+    {
+        /// <summary>
+        /// 模板ID
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 模板名称
+        /// </summary>
+        [Required]
+        [MaxLength(100)]
+        public string Name { get; set; }
+
+        /// <summary>
+        /// 模板代码（唯一标识）
+        /// </summary>
+        [Required]
+        [MaxLength(50)]
+        public string Code { get; set; }
+
+        /// <summary>
+        /// 模板主题
+        /// </summary>
+        [Required]
+        [MaxLength(500)]
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// 模板内容
+        /// </summary>
+        [Required]
+        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;
+    }
+}