fix(email): complete mail settings and templates

src/Settings/FacadeBulk.php

@@ -365,16 +365,7 @@ trait FacadeBulk {
 
     /** 获取SMTP配置 */
     public static function get_smtp(): array {
-        return get_option('aksrt_mail_smtp', [
-            'enabled'      => false,
-            'host'         => '',
-            'port'         => 465,
-            'username'     => '',
-            'password'     => '',
-            'encryption'   => 'ssl',
-            'from_name'    => '',
-            'from_address' => '',
-        ]);
+        return Mail::get_smtp();
     }
 
 
@@ -382,11 +373,12 @@ trait FacadeBulk {
     /** 获取邮件品牌设置（发件人昵称/标题前缀/底部内容） */
     public static function get_mail_branding(): array {
         $s = self::get_all();
+        $site = (string) get_bloginfo('name');
         return [
-            'showname'      => trim((string) ($s['mail_showname'] ?? '')),
-            'title_prefix'  => trim((string) ($s['mail_title_prefix'] ?? '')),
+            'showname'      => trim((string) ($s['mail_showname'] ?? $site)) ?: $site,
+            'title_prefix'  => trim((string) ($s['mail_title_prefix'] ?? '[' . $site . ']')) ?: '[' . $site . ']',
             'description'   => trim((string) ($s['mail_description'] ?? '')),
-            'more_content'  => trim((string) ($s['mail_more_content'] ?? '')),
+            'more_content'  => wp_kses_post((string) ($s['mail_more_content'] ?? '')),
         ];
     }