fix(email): derive SMTP auth from credentials

tests/widget-system/email-system-contract.test.cjs

@@ -9,6 +9,7 @@ const read = (file) => fs.readFileSync(path.join(root, file), 'utf8')
 const templates = read('src/Settings/MailTemplates.php')
 const mail = read('src/Settings/Mail.php')
 const notifications = read('src/Settings/MailNotifications.php')
+const coreHooks = read('inc/core-hooks/part-2.php')
 const globalController = read('src/Admin/GlobalController.php')
 const userController = read('src/Admin/UserController.php')
 const settings = read('src/Settings/Settings.php')
@@ -37,11 +38,28 @@ test('email templates and SMTP use one aksrt_settings schema', () => {
   assert.match(templates, /'option_key'\s*=>\s*'aksrt_settings'/)
   assert.match(templates, /'mail_passwd'.*'secret'\s*=>\s*true/)
   assert.match(mail, /Settings::get_all\(\)/)
+  assert.match(mail, /'auth'\s*=>\s*\$username\s*!==\s*''\s*&&\s*\$password\s*!==\s*''/)
+  assert.doesNotMatch(templates, /mail_smtpauth/)
+  assert.doesNotMatch(mail, /mail_smtpauth/)
   assert.doesNotMatch(settings, /aksrt_mail_smtp/)
   assert.doesNotMatch(globalController, /aksrt_mail_config|\/settings\/mail'/)
   assert.doesNotMatch(userController, /aksrt_mail_templates|mail-templates/)
 })
 
+test('SMTP authentication and failures use the canonical mail service', () => {
+  assert.match(coreHooks, /\$phpmailer->SMTPAuth\s*=\s*!empty\(\$mail\['auth'\]\)\s*&&\s*!empty\(\$mail\['username'\]\)/)
+  assert.match(mail, /add_action\('wp_mail_failed',\s*\$capture_failure\)/)
+  assert.match(mail, /remove_action\('wp_mail_failed',\s*\$capture_failure\)/)
+  assert.match(mail, /error_log\('\[AKSRT\] SMTP 测试失败：'/)
+  assert.match(globalController, /详细原因已写入服务器错误日志/)
+})
+
+test('canonical mail service contains no obsolete catalog or placeholder branches', () => {
+  assert.doesNotMatch(mail, /public static function events\s*\(/)
+  assert.doesNotMatch(mail, /replace_placeholders\([^\n]+,\s*false\)/)
+  assert.doesNotMatch(mail, /replace_placeholders\(string \$value, array \$placeholders, bool \$html\)/)
+})
+
 test('only the canonical mail service calls wp_mail', () => {
   const phpFiles = []
   const walk = (dir) => {