fix(admin): replicate reference advanced-filter settings page 1:1

- Rewrite post_list/filter schema (PHP + JS) with the reference theme's
  field set, order, defaults and dependencies; topics fields excluded
  (no topics taxonomy), AKSRT private filter_* toggles dropped
- Support dynamic checkbox options in AksField (options as formData key)
  so cat_custom_filter.custom_filters lists the custom_filter dimensions
- Map PostDisplay filter settings to the new keys without legacy fallback;
  cat_custom_filter now carries lists/dropdown fieldsets and array filters
- Wire the archive chain to reference semantics: cat_custom_filter
  overrides per-category filter projects, custom_filter_show gates the
  default display, dimension chip groups render on category/tag archives
- Filter archive queries (main query + AJAX endpoint) by _aksrt_cf_{key}
  meta with exact-quoted LIKE matching
- Add advanced-filter settings reference contract test

tag.php

@@ -54,6 +54,16 @@ if (!empty($archive_settings['ajax_tag_enabled']) && function_exists('aksrt_arch
 		$filter_groups[] = $group;
 	}
 }
+if (!empty($archive_settings['custom_filter_enabled']) && function_exists('aksrt_archive_build_custom_filter_groups')) {
+	$filter_groups = array_merge(
+		$filter_groups,
+		aksrt_archive_build_custom_filter_groups(
+			(array) ($archive_settings['custom_dimensions'] ?? []),
+			$archive_settings['custom_filter_keys'] ?? 'all',
+			$ajax_filter
+		)
+	);
+}
 
 if (function_exists('aksrt_archive_open_shell')) {
 	aksrt_archive_open_shell([