feat(payment): 补齐创作分成结算 + 收尾 auth 壳层欠账

- 新增 AKSRT_Creator_Revenue：监听 aksrt_order_paid，按 share_ratio 把商品作者分成写入既有 aksrt_revenue 台账（幂等、跳过自购），闭合此前"结算引擎"延后项；管理端 /payment/revenue 与 /shop 概览自动读取。
- page-verify-email 套用 sign 壳层与站点 logo，和 reset/bind 对齐。
- modal-auth 补 close_signup 门控，与全页登录页一致。

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

inc/classes/class-aksrt-creator-revenue.php

@@ -0,0 +1,145 @@
+<?php
+/**
+ * AKSRT Creator Revenue Settlement.
+ *
+ * Wires order-paid + non-shop paid content into the pre-existing revenue ledger
+ * (`aksrt_revenue` table + AKSRT_Revenue service). This closes the deferred
+ * "结算引擎" gap: the ledger, service and share-ratio settings already existed
+ * but nothing credited creator revenue when an order was paid.
+ *
+ * Scope (kept intentionally narrow):
+ * - Only shop-product orders and post-level paid content credit revenue.
+ * - Share ratio comes from AKSRT_Settings::get_payment_revenue_settings().
+ * - Buyer == author is skipped (no self-dealing).
+ * - Idempotent per order_number via a guard row lookup.
+ *
+ * @package AKSRT
+ */
+
+defined('ABSPATH') || exit;
+
+if (!class_exists('AKSRT_Creator_Revenue')) {
+
+    class AKSRT_Creator_Revenue {
+
+        private static ?AKSRT_Creator_Revenue $instance = null;
+
+        public static function get_instance(): self {
+            if (null === self::$instance) {
+                self::$instance = new self();
+            }
+            return self::$instance;
+        }
+
+        public function init(): void {
+            add_action('aksrt_order_paid', [$this, 'handle_order_paid'], 20, 2);
+        }
+
+        /**
+         * Whether creator revenue settlement is enabled.
+         */
+        private function is_enabled(): bool {
+            if (!class_exists('AKSRT_Revenue') || !class_exists('AKSRT_Settings')) {
+                return false;
+            }
+            $settings = AKSRT_Settings::get_payment_revenue_settings();
+            return !empty($settings['enabled']);
+        }
+
+        /**
+         * Resolve share ratio (percentage 0-100) for a given product author.
+         */
+        private function resolve_share_ratio(int $author_id): float {
+            $settings = AKSRT_Settings::get_payment_revenue_settings();
+            $ratio = (float) ($settings['share_ratio'] ?? 0);
+
+            // VIP-tier author overrides, if configured (>0 wins).
+            if ($author_id > 0 && function_exists('aksrt_get_user_vip_level')) {
+                $level = (int) aksrt_get_user_vip_level($author_id);
+                if ($level === 1 && (float) ($settings['ratio_vip1'] ?? 0) > 0) {
+                    $ratio = (float) $settings['ratio_vip1'];
+                } elseif ($level >= 2 && (float) ($settings['ratio_vip2'] ?? 0) > 0) {
+                    $ratio = (float) $settings['ratio_vip2'];
+                }
+            }
+
+            return max(0.0, min(100.0, $ratio));
+        }
+
+        /**
+         * Guard: has this order already been settled into revenue?
+         */
+        private function already_settled(string $order_number): bool {
+            if ($order_number === '' || !class_exists('AKSRT_DB_Migrator')) {
+                return false;
+            }
+            global $wpdb;
+            $table = AKSRT_DB_Migrator::table('revenue');
+            if ($table === '') {
+                return false;
+            }
+            $count = (int) $wpdb->get_var($wpdb->prepare(
+                "SELECT COUNT(*) FROM {$table} WHERE order_number = %s AND type = %s",
+                $order_number,
+                'order'
+            ));
+            return $count > 0;
+        }
+
+        /**
+         * aksrt_order_paid listener: credit creators their share.
+         *
+         * @param string $order_number Paid order number.
+         * @param array  $order        Order row (status=paid).
+         */
+        public function handle_order_paid(string $order_number, array $order): void {
+            if (!$this->is_enabled() || $order_number === '') {
+                return;
+            }
+            if ($this->already_settled($order_number)) {
+                return;
+            }
+
+            $buyer_id = (int) ($order['user_id'] ?? 0);
+
+            $items = [];
+            if (class_exists('AKSRT_Shop')) {
+                $shop = AKSRT_Shop::get_instance();
+                if (method_exists($shop, 'get_order_items')) {
+                    $items = (array) $shop->get_order_items($order_number);
+                }
+            }
+
+            if (empty($items)) {
+                return; // Only structured shop-product orders settle creator revenue here.
+            }
+
+            $revenue = AKSRT_Revenue::get_instance();
+
+            foreach ($items as $item) {
+                $product_id = (int) ($item['product_id'] ?? 0);
+                $pay_price  = (float) ($item['pay_price'] ?? $item['total_price'] ?? 0);
+                if ($product_id <= 0 || $pay_price <= 0) {
+                    continue;
+                }
+
+                $author_id = (int) get_post_field('post_author', $product_id);
+                if ($author_id <= 0 || $author_id === $buyer_id) {
+                    continue; // No author, or buyer is the author.
+                }
+
+                $ratio  = $this->resolve_share_ratio($author_id);
+                if ($ratio <= 0) {
+                    continue;
+                }
+
+                $amount = round($pay_price * $ratio / 100, 2);
+                if ($amount <= 0) {
+                    continue;
+                }
+
+                $revenue->add($author_id, $amount, $order_number, 'order');
+            }
+        }
+    }
+}