feat: add mail service for managing email configurations, generating accounts, and fetching emails with verification code support.

backend/internal/mail/service.go

@@ -363,21 +363,30 @@ func (m *Client) WaitForCode(email string, timeout time.Duration) (string, error
 			for _, mail := range emails {
 				subject := strings.ToLower(mail.Subject)
 				// 匹配多种可能的验证码邮件主题
+				// 包括 "Your ChatGPT code is 016547" 格式
 				isCodeEmail := strings.Contains(subject, "code") ||
 					strings.Contains(subject, "verify") ||
 					strings.Contains(subject, "verification") ||
 					strings.Contains(subject, "openai") ||
-					strings.Contains(subject, "confirm")
+					strings.Contains(subject, "confirm") ||
+					strings.Contains(subject, "chatgpt")
 
 				if !isCodeEmail {
 					continue
 				}
 
+				// 优先从标题中提取验证码 (如 "Your ChatGPT code is 016547")
+				matches := codeRegex.FindStringSubmatch(mail.Subject)
+				if len(matches) >= 2 {
+					return matches[1], nil
+				}
+
+				// 如果标题中没有，从内容中提取
 				content := mail.Content
 				if content == "" {
 					content = mail.Text
 				}
-				matches := codeRegex.FindStringSubmatch(content)
+				matches = codeRegex.FindStringSubmatch(content)
 				if len(matches) >= 2 {
 					return matches[1], nil
 				}