fix(admin): replicate reference comment settings page 1:1

- Rewrite post_list/comment schema (PHP + JS) with the reference theme's
  field set, order, defaults and dependencies; smilie, comment location
  and quick-reply fields excluded
- Map PostDisplay::get_comment_display_settings() to the new keys without
  legacy fallback: close_comments, comment_paginate_type (ajax_lists),
  user_edit_comment master switch, WP comment_order for sorting
- Wire comment_box_hide visibility gate (signin / vip / vip_2 / auth)
- Drop dead comment settings (order/per_page/depth/avatar/hot threshold/
  empty text/city), the dead post_close_comments field, and city readers
  now fully owned by the IP-geo extension
- Add comment settings reference contract test

inc/helpers/aksrt-comments.php

@@ -63,6 +63,32 @@ add_filter('comments_template_query_args', static function ($args) {
 		: $args;
 });
 
+if (!function_exists('aksrt_comment_box_visible')) :
+	/**
+	 * Whether the comment module may render for the current visitor.
+	 *
+	 * Mirrors the reference theme's comment_box_hide conditions.
+	 */
+	function aksrt_comment_box_visible(): bool {
+		$settings = class_exists('\AKSRT\Settings\Settings')
+			? \AKSRT\Settings\Settings::get_comment_display_settings()
+			: [];
+		$hide = sanitize_key((string) ($settings['box_hide'] ?? ''));
+		switch ($hide) {
+			case 'signin':
+				return is_user_logged_in();
+			case 'vip':
+				return function_exists('aksrt_is_vip') && aksrt_is_vip();
+			case 'vip_2':
+				return function_exists('aksrt_is_vip2') && aksrt_is_vip2();
+			case 'auth':
+				return function_exists('aksrt_current_user_is_verified') && aksrt_current_user_is_verified();
+			default:
+				return true;
+		}
+	}
+endif;
+
 if (!function_exists('aksrt_comments_build_context')) :
 	/**
 	 * Resolve comments runtime context once.
@@ -116,6 +142,7 @@ if (!function_exists('aksrt_comments_build_context')) :
 			'title_text'        => (string) ($settings['title'] ?? __('评论', 'aksrt')),
 			'corderby_enabled'  => !empty($settings['corderby']),
 			'close_comments'    => !empty($settings['close_comments']),
+			'box_hidden'        => !aksrt_comment_box_visible(),
 			'oauth_providers'   => class_exists('\AKSRT\Auth\OAuth')
 				? \AKSRT\Auth\OAuth::get_instance()->get_auth_providers_data()
 				: [],
@@ -646,7 +673,7 @@ if (!function_exists('aksrt_comments_render')) :
 			}
 
 			$ctx = aksrt_comments_build_context();
-			if (!empty($ctx['close_comments'])) {
+			if (!empty($ctx['close_comments']) || !empty($ctx['box_hidden'])) {
 				return;
 			}