fix(email): complete mail settings and templates

src/Settings/Settings.php

@@ -34,7 +34,6 @@ class Settings {
      * 用于导入导出完整性检查。
      */
     public const STANDALONE_OPTION_KEYS = [
-        'aksrt_mail_smtp',
         'aksrt_captcha_config',
         'aksrt_moderation_config',
         'aksrt_download_config',
@@ -55,7 +54,6 @@ class Settings {
      * 包含 secret 字段的 option key — 永不进入独立导入导出。
      */
     public const SECRET_OPTION_KEYS = [
-        'aksrt_mail_smtp',
         'aksrt_captcha_config',
         'aksrt_identity_secrets',
     ];
@@ -617,6 +615,9 @@ class Settings {
      * @return array<string,mixed>
      */
     public static function redact_sensitive_settings(array $payload): array {
+        if (isset($payload['domains']['global']['data']) && is_array($payload['domains']['global']['data'])) {
+            unset($payload['domains']['global']['data']['mail_passwd']);
+        }
         if (isset($payload['standalone']) && is_array($payload['standalone'])) {
             $blocked = array_merge(self::SCHEMA_MANAGED_STANDALONE_OPTION_KEYS, self::SECRET_OPTION_KEYS);
             foreach ($blocked as $option_key) {