初步完成邮件功能

DMS.Application/DTOs/CreateEmailAccountRequest.cs

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+namespace DMS.Application.DTOs
+{
+    /// <summary>
+    /// 创建邮件账户请求DTO
+    /// </summary>
+    public class CreateEmailAccountRequest
+    {
+        /// <summary>
+        /// 账户名称
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// 邮箱地址
+        /// </summary>
+        public string EmailAddress { get; set; }
+
+        /// <summary>
+        /// SMTP服务器地址
+        /// </summary>
+        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>
+        public string Username { get; set; }
+
+        /// <summary>
+        /// 密码
+        /// </summary>
+        public string Password { get; set; }
+
+        /// <summary>
+        /// IMAP服务器地址
+        /// </summary>
+        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;
+    }
+}

DMS.Application/DTOs/EmailAccountDto.cs

@@ -0,0 +1,73 @@
+namespace DMS.Application.DTOs
+{
+    /// <summary>
+    /// 邮件账户DTO
+    /// </summary>
+    public class EmailAccountDto
+    {
+        /// <summary>
+        /// 账户ID
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 账户名称
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// 邮箱地址
+        /// </summary>
+        public string EmailAddress { get; set; }
+
+        /// <summary>
+        /// SMTP服务器地址
+        /// </summary>
+        public string SmtpServer { get; set; }
+
+        /// <summary>
+        /// SMTP端口号
+        /// </summary>
+        public int SmtpPort { get; set; }
+
+        /// <summary>
+        /// 是否启用SSL
+        /// </summary>
+        public bool EnableSsl { get; set; }
+
+        /// <summary>
+        /// 用户名
+        /// </summary>
+        public string Username { get; set; }
+
+        /// <summary>
+        /// IMAP服务器地址
+        /// </summary>
+        public string? ImapServer { get; set; }
+
+        /// <summary>
+        /// IMAP端口号
+        /// </summary>
+        public int ImapPort { get; set; }
+
+        /// <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; }
+
+        /// <summary>
+        /// 创建时间
+        /// </summary>
+        public DateTime CreatedAt { get; set; }
+
+        /// <summary>
+        /// 更新时间
+        /// </summary>
+        public DateTime UpdatedAt { get; set; }
+    }
+}

DMS.Application/DTOs/EmailLogDto.cs

@@ -0,0 +1,38 @@
+namespace DMS.Application.DTOs
+{
+    /// <summary>
+    /// 邮件日志DTO
+    /// </summary>
+    public class EmailLogDto
+    {
+        /// <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>
+        public string Level { get; set; }
+
+        /// <summary>
+        /// 日志消息
+        /// </summary>
+        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; }
+    }
+}

DMS.Application/DTOs/EmailMessageDto.cs

@@ -0,0 +1,73 @@
+namespace DMS.Application.DTOs
+{
+    /// <summary>
+    /// 邮件消息DTO
+    /// </summary>
+    public class EmailMessageDto
+    {
+        /// <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>
+        public string From { get; set; }
+
+        /// <summary>
+        /// 收件人邮箱地址（多个用分号分隔）
+        /// </summary>
+        public string To { get; set; }
+
+        /// <summary>
+        /// 抄送邮箱地址（多个用分号分隔）
+        /// </summary>
+        public string? Cc { get; set; }
+
+        /// <summary>
+        /// 密送邮箱地址（多个用分号分隔）
+        /// </summary>
+        public string? Bcc { get; set; }
+
+        /// <summary>
+        /// 邮件主题
+        /// </summary>
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// 邮件正文
+        /// </summary>
+        public string Body { get; set; }
+
+        /// <summary>
+        /// 是否为HTML格式
+        /// </summary>
+        public bool IsHtml { get; set; }
+
+        /// <summary>
+        /// 邮件发送状态
+        /// </summary>
+        public string Status { get; set; }
+
+        /// <summary>
+        /// 发送时间
+        /// </summary>
+        public DateTime? SentAt { get; set; }
+
+        /// <summary>
+        /// 创建时间
+        /// </summary>
+        public DateTime CreatedAt { get; set; }
+
+        /// <summary>
+        /// 更新时间
+        /// </summary>
+        public DateTime UpdatedAt { get; set; }
+    }
+}

DMS.Application/DTOs/EmailTemplateDto.cs

@@ -0,0 +1,53 @@
+namespace DMS.Application.DTOs
+{
+    /// <summary>
+    /// 邮件模板DTO
+    /// </summary>
+    public class EmailTemplateDto
+    {
+        /// <summary>
+        /// 模板ID
+        /// </summary>
+        public int Id { get; set; }
+
+        /// <summary>
+        /// 模板名称
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// 模板代码（唯一标识）
+        /// </summary>
+        public string Code { get; set; }
+
+        /// <summary>
+        /// 模板主题
+        /// </summary>
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// 模板内容
+        /// </summary>
+        public string Body { get; set; }
+
+        /// <summary>
+        /// 是否为HTML格式
+        /// </summary>
+        public bool IsHtml { get; set; }
+
+        /// <summary>
+        /// 是否启用
+        /// </summary>
+        public bool IsActive { get; set; }
+
+        /// <summary>
+        /// 创建时间
+        /// </summary>
+        public DateTime CreatedAt { get; set; }
+
+        /// <summary>
+        /// 更新时间
+        /// </summary>
+        public DateTime UpdatedAt { get; set; }
+    }
+}

DMS.Application/DTOs/SendEmailRequest.cs

@@ -0,0 +1,43 @@
+namespace DMS.Application.DTOs
+{
+    /// <summary>
+    /// 发送邮件请求DTO
+    /// </summary>
+    public class SendEmailRequest
+    {
+        /// <summary>
+        /// 关联的邮件账户ID
+        /// </summary>
+        public int EmailAccountId { get; set; }
+
+        /// <summary>
+        /// 收件人邮箱地址（多个用分号分隔）
+        /// </summary>
+        public string To { get; set; }
+
+        /// <summary>
+        /// 抄送邮箱地址（多个用分号分隔）
+        /// </summary>
+        public string? Cc { get; set; }
+
+        /// <summary>
+        /// 密送邮箱地址（多个用分号分隔）
+        /// </summary>
+        public string? Bcc { get; set; }
+
+        /// <summary>
+        /// 邮件主题
+        /// </summary>
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// 邮件正文
+        /// </summary>
+        public string Body { get; set; }
+
+        /// <summary>
+        /// 是否为HTML格式
+        /// </summary>
+        public bool IsHtml { get; set; } = true;
+    }
+}