refactor(api): separate Yggdrasil routes from v1 API group

Move Yggdrasil API endpoints from /api/v1/yggdrasil to /api/yggdrasil for
better route organization and compatibility with standard Yggdrasil protocol.
Also upgrade Go to 1.25, update dependencies, and migrate email package from
jordan-wright/email to gopkg.in/mail.v2. Remove deprecated UUID design plan.

pkg/email/email.go

@@ -3,13 +3,11 @@ package email
 import (
 	"crypto/tls"
 	"fmt"
-	"net/smtp"
-	"net/textproto"
 
 	"carrotskin/pkg/config"
-	
-	"github.com/jordan-wright/email"
+
 	"go.uber.org/zap"
+	gomail "gopkg.in/mail.v2"
 )
 
 // Service 邮件服务
@@ -36,7 +34,7 @@ func (s *Service) SendVerificationCode(to, code, purpose string) error {
 	subject := s.getSubject(purpose)
 	body := s.getBody(code, purpose)
 
-	return s.send([]string{to}, subject, body)
+	return s.send(to, subject, body)
 }
 
 // SendResetPassword 发送重置密码邮件
@@ -55,23 +53,13 @@ func (s *Service) SendChangeEmail(to, code string) error {
 }
 
 // send 发送邮件
-func (s *Service) send(to []string, subject, body string) error {
-	e := email.NewEmail()
-	e.From = fmt.Sprintf("%s <%s>", s.cfg.FromName, s.cfg.Username)
-	e.To = to
-	e.Subject = subject
-	e.HTML = []byte(body)
-	e.Headers = textproto.MIMEHeader{}
+func (s *Service) send(to, subject, body string) error {
+	m := gomail.NewMessage()
+	m.SetHeader("From", fmt.Sprintf("%s <%s>", s.cfg.FromName, s.cfg.Username))
+	m.SetHeader("To", to)
+	m.SetHeader("Subject", subject)
+	m.SetBody("text/html", body)
 
-	// SMTP认证
-	auth := smtp.PlainAuth("", s.cfg.Username, s.cfg.Password, s.cfg.SMTPHost)
-
-	// 发送邮件
-	addr := fmt.Sprintf("%s:%d", s.cfg.SMTPHost, s.cfg.SMTPPort)
-	
-	// 判断端口决定发送方式
-	// 465端口使用SSL/TLS（隐式TLS）
-	// 587端口使用STARTTLS（显式TLS）
 	var err error
 	if s.cfg.SMTPPort == 465 {
 		// 使用SSL/TLS连接（适用于465端口）
@@ -79,15 +67,28 @@ func (s *Service) send(to []string, subject, body string) error {
 			ServerName:         s.cfg.SMTPHost,
 			InsecureSkipVerify: false, // 生产环境建议设置为false
 		}
-		err = e.SendWithTLS(addr, auth, tlsConfig)
+		d := &gomail.Dialer{
+			Host:      s.cfg.SMTPHost,
+			Port:      s.cfg.SMTPPort,
+			Username:  s.cfg.Username,
+			Password:  s.cfg.Password,
+			TLSConfig: tlsConfig,
+		}
+		err = d.DialAndSend(m)
 	} else {
 		// 使用STARTTLS连接（适用于587端口等）
-		err = e.Send(addr, auth)
+		d := &gomail.Dialer{
+			Host:     s.cfg.SMTPHost,
+			Port:     s.cfg.SMTPPort,
+			Username: s.cfg.Username,
+			Password: s.cfg.Password,
+		}
+		err = d.DialAndSend(m)
 	}
-	
+
 	if err != nil {
 		s.logger.Error("发送邮件失败",
-			zap.Strings("to", to),
+			zap.String("to", to),
 			zap.String("subject", subject),
 			zap.String("smtp_host", s.cfg.SMTPHost),
 			zap.Int("smtp_port", s.cfg.SMTPPort),
@@ -97,7 +98,7 @@ func (s *Service) send(to []string, subject, body string) error {
 	}
 
 	s.logger.Info("邮件发送成功",
-		zap.Strings("to", to),
+		zap.String("to", to),
 		zap.String("subject", subject),
 	)