feat(identity): author card, per-user tip, comment caps, task status

Author card uses configurable limit/orderby/style and self CTAs.
Tip is per-user weixin/alipay QR modal (no site-global image).
Comment action permissions honor user_caps matrix.
Free points tasks expose done_today/passive status + better comment deep link.
audit-admin-contracts errors=0.

inc/helpers/user-center-renderers/credits-points-tasks.php

@@ -167,8 +167,10 @@ $pane    = isset($points_tasks_pane) ? sanitize_key((string) $points_tasks_pane)
 				<?php
 				$task_key = sanitize_key((string) ($task['key'] ?? ''));
 				$action   = $aksrt_points_task_action($task_key);
+				$status   = sanitize_key((string) ($task['status'] ?? 'todo'));
+				$done     = in_array($status, ['done_today', 'done'], true);
 				?>
-				<div class="border-bottom padding-h10 uc-points-tasks__row" data-task-key="<?php echo esc_attr($task_key); ?>">
+				<div class="border-bottom padding-h10 uc-points-tasks__row<?php echo $done ? ' is-done' : ''; ?>" data-task-key="<?php echo esc_attr($task_key); ?>" data-status="<?php echo esc_attr($status); ?>">
 					<div class="flex jsb ac">
 						<div class="flex1 mr20">
 							<div class="font-bold mb6"><?php echo esc_html((string) $task['title']); ?></div>