初步完成邮件功能

DMS.Core/Interfaces/Repositories/IEmailMessageRepository.cs

@@ -0,0 +1,20 @@
+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);
+    }
+}