feat(user-center): deepen zibll parity and profile media

uninstall.php

@@ -57,6 +57,8 @@ if ($options) {
 // ── Delete AKSRT user meta ──
 $meta_keys = [
     'aksrt_user_contacts',
+    'aksrt_avatar_attachment_id',
+    'aksrt_background_attachment_id',
     'aksrt_background_image',
     'aksrt_email_verification_status',
     'aksrt_email_verified_at',