feat(forum): P1 topic coupons, P2 plate follow gateway, cash creator revenue

- Topic_Pay: soft/hard coupon validate, payable amount, free-after-discount, paid burn
- Creator_Revenue: settle content/topic/plate_follow cash (type=order), keep shop path
- Plate VIP1/VIP2 meta + resolve_plate_follow_pay_price via aksrt_get_user_vip_level
- New AKSRT_Plate_Follow_Pay REST multi-gateway; remove Credits×100 money bypass
- Frontend: cms-download plate_follow apiKind + forum-governance money cashier bridge

inc/core-hooks/part-1.php

@@ -382,7 +382,9 @@ function aksrt_register_forum_topic_meta() {
         '_aksrt_follow_pay_modo'   => ['type' => 'string',  'default' => 'money'],
         '_aksrt_follow_pay_price'  => ['type' => 'number',  'default' => 0],
         '_aksrt_follow_pay_points' => ['type' => 'integer', 'default' => 0],
-        '_aksrt_follow_pay_vip_price' => ['type' => 'number', 'default' => 0],
+        '_aksrt_follow_pay_vip_price' => ['type' => 'number', 'default' => 0], // legacy read fallback → vip1
+        '_aksrt_follow_pay_vip1_price' => ['type' => 'number', 'default' => 0],
+        '_aksrt_follow_pay_vip2_price' => ['type' => 'number', 'default' => 0],
     ];
 
     foreach ($plate_meta as $key => $args) {