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();
+    }
+}