feat: 收口 1:1 剩余欠账（论坛壳/圈子/501/私信默认/资源死码）

- 论坛 board/topic/plate/tag/plate-cat 接入 content-wrap/content-layout 主站流壳
- 公共主页 plate 圈子 tab 接关注/管理版块真实数据并计数
- forum-topic 渲染封面/付费扩展位 meta（§7.3）
- 后台删除消息/背景图/评论图 REST 从 501 补齐为真实实现
- 私信 private_s 缺省 true（完整 1:1，不再兼容默认关）
- 清理 aksrt_get_resource_meta 不可达旧实现；挂载 AKSRT_AI 配置门控实例
- 登录 modal 启用 colorful-header；订单页粉边 focus 软化；侧栏次级入口视觉弱化

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

inc/helpers/aksrt-user-home.php

@@ -92,13 +92,38 @@ if (!function_exists('aksrt_get_user_home_page_context')) {
 			$follow_count = (int) AKSRT_Follow::get_instance()->get_following_count($user_id);
 		}
 
+		$plate_count = 0;
+		if ($forum_instance) {
+			$seen_plates = [];
+			if (method_exists($forum_instance, 'get_user_followed_plates')) {
+				foreach ((array) $forum_instance->get_user_followed_plates($user_id) as $plate) {
+					$pid = (int) ($plate['id'] ?? 0);
+					if ($pid > 0) {
+						$seen_plates[$pid] = true;
+					}
+				}
+			}
+			if (method_exists($forum_instance, 'get_user_managed_plates')) {
+				$managed = (array) $forum_instance->get_user_managed_plates($user_id);
+				foreach (['owned', 'moderating'] as $bucket) {
+					foreach ((array) ($managed[$bucket] ?? []) as $plate) {
+						$pid = (int) ($plate['id'] ?? 0);
+						if ($pid > 0) {
+							$seen_plates[$pid] = true;
+						}
+					}
+				}
+			}
+			$plate_count = count($seen_plates);
+		}
+
 		$tab_counts = [
 			'posts'     => $post_count,
 			'comments'  => $comment_count,
 			'favorites' => $favorite_count,
 			'credits'   => $credits_enabled && $is_own_profile ? (int) round((float) $credit_balance) : 0,
 			'product'   => $product_count,
-			'plate'     => 0,
+			'plate'     => $plate_count,
 			'forum'     => $forum_topic_count,
 			'follow'    => $follow_count,
 		];