feat: 添加存储配置管理功能

- 添加存储配置管理页面（列表、创建、编辑）
- 支持本地存储、S3、WebDAV、FTP、SFTP 等存储类型
- 添加存储配置测试连接功能
- 本地存储自动初始化且禁止删除
- 修复 Switch 组件状态显示问题
- 添加更新存储配置时的 status 字段支持

backend/internal/service/email.go

@@ -41,14 +41,14 @@ func (s *EmailService) SendEmail(config EmailConfig, to, subject, body string) e
 
 	auth := smtp.PlainAuth("", config.User, config.Password, config.Host)
 
-	if config.UseSSL || config.Port == 465 || config.Port == 587 {
-		return s.sendWithTLS(addr, auth, from, []string{to}, []byte(msg))
+	if config.Port == 465 || config.UseSSL {
+		return s.sendWithImplicitTLS(addr, auth, from, []string{to}, []byte(msg))
 	}
 
-	return smtp.SendMail(addr, auth, from, []string{to}, []byte(msg))
+	return s.sendWithSTARTTLS(addr, auth, from, []string{to}, []byte(msg))
 }
 
-func (s *EmailService) sendWithTLS(addr string, auth smtp.Auth, from string, to []string, msg []byte) error {
+func (s *EmailService) sendWithImplicitTLS(addr string, auth smtp.Auth, from string, to []string, msg []byte) error {
 	host := strings.Split(addr, ":")[0]
 
 	tlsConfig := &tls.Config{
@@ -99,6 +99,62 @@ func (s *EmailService) sendWithTLS(addr string, auth smtp.Auth, from string, to
 	return client.Quit()
 }
 
+func (s *EmailService) sendWithSTARTTLS(addr string, auth smtp.Auth, from string, to []string, msg []byte) error {
+	host := strings.Split(addr, ":")[0]
+
+	client, err := smtp.Dial(addr)
+	if err != nil {
+		return fmt.Errorf("连接SMTP服务器失败: %v", err)
+	}
+	defer client.Close()
+
+	if err = client.Hello("localhost"); err != nil {
+		return fmt.Errorf("HELO命令失败: %v", err)
+	}
+
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: true,
+		ServerName:         host,
+	}
+
+	if ok, _ := client.Extension("STARTTLS"); ok {
+		if err = client.StartTLS(tlsConfig); err != nil {
+			return fmt.Errorf("STARTTLS失败: %v", err)
+		}
+	}
+
+	if err = client.Auth(auth); err != nil {
+		return fmt.Errorf("SMTP认证失败: %v", err)
+	}
+
+	if err = client.Mail(from); err != nil {
+		return fmt.Errorf("设置发件人失败: %v", err)
+	}
+
+	for _, addr := range to {
+		if err = client.Rcpt(addr); err != nil {
+			return fmt.Errorf("设置收件人失败: %v", err)
+		}
+	}
+
+	w, err := client.Data()
+	if err != nil {
+		return fmt.Errorf("准备邮件数据失败: %v", err)
+	}
+
+	_, err = w.Write(msg)
+	if err != nil {
+		return fmt.Errorf("写入邮件内容失败: %v", err)
+	}
+
+	err = w.Close()
+	if err != nil {
+		return fmt.Errorf("关闭邮件写入失败: %v", err)
+	}
+
+	return client.Quit()
+}
+
 func (s *EmailService) buildMessage(fromName, from, to, subject, body string) string {
 	msg := ""