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

src/Settings/PostDisplay.php

@@ -339,12 +339,13 @@ class PostDisplay {
 
     public static function get_comment_display_settings(): array {
         $settings = Settings::get_all();
-        $order = sanitize_key((string) ($settings['comment_order'] ?? 'desc'));
+
+        // 评论排序由 WP 讨论设置决定（与参考主题一致：主题不再提供排序配置）。
+        $order = sanitize_key((string) get_option('comment_order', 'desc'));
         if (!in_array($order, ['asc', 'desc'], true)) {
             $order = 'desc';
         }
 
-        $empty_text = trim((string) ($settings['comment_empty_text'] ?? ''));
         $submit_text = trim((string) ($settings['comment_submit_text'] ?? ''));
         $box_placeholder = trim((string) ($settings['comment_text'] ?? ''));
         $title = trim((string) ($settings['comment_title'] ?? ''));
@@ -354,11 +355,8 @@ class PostDisplay {
             'pagination_mode'    => self::get_comment_pagination_mode(),
             'paging_ajax_ias'    => !isset($settings['comment_paging_ajax_ias_s']) || !empty($settings['comment_paging_ajax_ias_s']),
             'paging_ajax_ias_max'=> max(0, min(10, (int) ($settings['comment_paging_ajax_ias_max'] ?? 3))),
-            'per_page'           => max(5, min(100, (int) ($settings['comment_per_page'] ?? 20))),
-            'nested_depth'       => max(1, min(10, (int) ($settings['comment_nested_depth'] ?? 3))),
             'require_login'      => Settings::comment_requires_registration(),
-            'avatar_size'        => max(24, min(96, (int) ($settings['comment_avatar_size'] ?? 48))),
-            'empty_text'         => $empty_text !== '' ? $empty_text : __('暂无评论，来做第一个评论的人吧~', 'aksrt'),
+            'box_hide'           => sanitize_key((string) ($settings['comment_box_hide'] ?? '')),
             'toolbar'            => [
                 'code'       => !isset($settings['comment_code']) || !empty($settings['comment_code']),
                 'image'      => !isset($settings['comment_img']) || !empty($settings['comment_img']),
@@ -372,34 +370,15 @@ class PostDisplay {
             'like_enabled'       => !isset($settings['comment_like_s']) || !empty($settings['comment_like_s']),
             'author_tag'         => !isset($settings['comment_author_tag']) || !empty($settings['comment_author_tag']),
             'corderby'           => !isset($settings['comment_corderby']) || !empty($settings['comment_corderby']),
-            'edit_window'        => max(0, min(1440, (int) ($settings['comment_edit_window'] ?? 10))),
+            'user_edit'          => !isset($settings['user_edit_comment']) || !empty($settings['user_edit_comment']),
             'submit_text'        => $submit_text !== '' ? $submit_text : __('提交评论', 'aksrt'),
             'box_placeholder'    => $box_placeholder !== '' ? $box_placeholder : __('说点什么吧...', 'aksrt'),
             'title'              => $title !== '' ? $title : __('评论', 'aksrt'),
-            // Extended legacy-parity settings.
-            'close_comments'     => !empty($settings['comment_close_comments']),
-            'hot_threshold'      => max(1, min(999, (int) ($settings['comment_hot_threshold'] ?? 10))),
+            'close_comments'     => !empty($settings['close_comments']),
             'user_url'           => !empty($settings['comment_user_url_s']),
-            'city_s'             => !isset($settings['comment_city_s']) || !empty($settings['comment_city_s']),
-            'city_type'          => self::normalize_comment_city_type((string) ($settings['comment_city_type'] ?? 'province_city')),
         ];
     }
 
-    private static function normalize_comment_city_type(string $type): string {
-        $type = sanitize_key($type);
-        // Map legacy legacy pro/city labels.
-        if ($type === 'pro') {
-            return 'province';
-        }
-        if ($type === 'city') {
-            return 'province_city';
-        }
-        return in_array($type, ['province_city', 'province', 'country_province'], true)
-            ? $type
-            : 'province_city';
-    }
-
-
     public static function apply_list_orderby($query): void {
         if (is_admin() || !($query instanceof \WP_Query) || !$query->is_main_query()) {
             return;
@@ -467,11 +446,9 @@ class PostDisplay {
     }
 
     public static function get_comment_pagination_mode(): string {
-        $mode = (string) Settings::get_value('comment_pagination_type', 'numbered');
-        if ($mode === 'page') {
-            $mode = 'numbered';
-        }
-        return in_array($mode, ['numbered', 'load_more', 'infinite'], true) ? $mode : 'numbered';
+        // 与参考主题一致：ajax_lists = AJAX 追加列表翻页，其余为数字翻页按钮。
+        $mode = (string) Settings::get_value('comment_paginate_type', 'default');
+        return $mode === 'ajax_lists' ? 'ajax_lists' : 'numbered';
     }
 
     private static function sanitize_custom_filter_defs($raw): array {