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/class-aksrt-rebate.php

@@ -64,7 +64,15 @@ class AKSRT_Rebate {
             'note'           => $note,
         ]);
 
-        return $result ? (int) $wpdb->insert_id : 0;
+                $id = $result ? (int) $wpdb->insert_id : 0;
+        if ($id > 0) {
+            do_action('aksrt_pay_rebate_added', $user_id, $amount, [
+                'rebate_id'     => $id,
+                'order_number'  => $order_number,
+                'type'          => $type,
+            ]);
+        }
+        return $id;
     }
 
     /**