feat(identity): tip QR upload, metrics engine, comment moderate caps

Close identity 1:1 gaps after p1: user-center weixin/alipay tip QR
upload+save, AKSRT_User_Metrics counters for medal get_type and level
XP bridges, forum/revenue/signin hooks, comment moderate via user_caps,
and clearer free-task deep links/status CTAs.

inc/classes/forum/class-aksrt-forum-comment-service.php

@@ -309,6 +309,7 @@ class AKSRT_Forum_Comment_Service {
 
         update_comment_meta($comment_id, '_aksrt_adopted', '1');
         update_post_meta($topic_id, '_aksrt_adopted_comment', $comment_id);
+        do_action('aksrt_forum_reply_adopted', $topic_id, $comment_id, (int) $comment->user_id);
         update_post_meta($topic_id, '_aksrt_question_status', 1); // QUESTION_SOLVED
 
         $adoptee_id = (int) $comment->user_id;
@@ -507,6 +508,8 @@ class AKSRT_Forum_Comment_Service {
         }
 
         update_comment_meta($comment_id, '_aksrt_is_hot', '1');
+        $hot_author = (int) (get_comment($comment_id)->user_id ?? 0);
+        do_action('aksrt_forum_comment_hot', $comment_id, $hot_author);
 
         // Credit the comment author (free-task day cap).
         $author_id = (int) $comment->user_id;