feat: 支持强制使用 AUTH LOGIN 以解决 outlook 等邮箱的发件问题 (#4112)

* feat: 支持强制使用 AUTH LOGIN 以解决 outlook 等邮箱的发件问题

* fix: 修复通过 SSL 发送邮件时绕过 AUTH LOGIN 的问题

* fix: remove redundant branch, delete test file, add i18n translations

- Remove redundant else-if branch in SendEmail since auth is already
  computed via getSMTPAuth()
- Delete option_smtp_auth_test.go as requested
- Add i18n translations for '强制使用 AUTH LOGIN' checkbox

web/src/components/settings/SystemSetting.jsx

@@ -91,6 +91,7 @@ const SystemSetting = () => {
     EmailDomainRestrictionEnabled: '',
     EmailAliasRestrictionEnabled: '',
     SMTPSSLEnabled: '',
+    SMTPForceAuthLogin: '',
     EmailDomainWhitelist: [],
     TelegramOAuthEnabled: '',
     TelegramBotToken: '',
@@ -182,6 +183,7 @@ const SystemSetting = () => {
           case 'EmailDomainRestrictionEnabled':
           case 'EmailAliasRestrictionEnabled':
           case 'SMTPSSLEnabled':
+          case 'SMTPForceAuthLogin':
           case 'LinuxDOOAuthEnabled':
           case 'discord.enabled':
           case 'oidc.enabled':
@@ -1335,6 +1337,15 @@ const SystemSetting = () => {
                       >
                         {t('启用SMTP SSL')}
                       </Form.Checkbox>
+                      <Form.Checkbox
+                        field='SMTPForceAuthLogin'
+                        noLabel
+                        onChange={(e) =>
+                          handleCheckboxChange('SMTPForceAuthLogin', e)
+                        }
+                      >
+                        {t('强制使用 AUTH LOGIN')}
+                      </Form.Checkbox>
                     </Col>
                   </Row>
                   <Button onClick={submitSMTP}>{t('保存 SMTP 设置')}</Button>