feat: remove shop feature (Phase 2)

Delete all shop domain classes, controllers, schema builders, templates,
JS/CSS, admin SPA pages, and shop-only payment classes (Shipping,
AfterSale, Discount). Remove shop-only DB table definitions (product_variant,
after_sale, order_shipping, card_key) from migrator and add their DROP
to uninstall.php. Clean up shared files:

- Remove aksrt_product CPT + taxonomies from Setup.php
- Remove shop rewrite rules/query vars/template redirect from SetupPart2.php
- Remove shop widget areas from SetupPart1.php
- Remove shop enqueues from ScriptsPart1b.php
- Remove sepakerator-aksrt-shop from SetupPart2.php
- Remove get_shop_settings facade (delete ForumShop.php, clean DomainGroups.php)
- Remove ORDER_PRODUCT_SHOP constant from DomainModel.php
- Remove Shop::class fallback branches from UserOrders.php, OrderCenterRest.php
- Remove shipping/after-sale branches from OrderRepositoryAdmin.php, PayMenus.php, PayOrders.php
- Remove shop product widgets from widgets-register.php
- Remove cart page from template-registry.php, routing.php, ScriptsPart2.php
- Remove cart UI from sidebar-nav.php, profile-orders.php, sidebar-orders.php
- Clean up order-center.js (remove rebuy/cartUrl/receipt/after-sale handlers)
- Remove aksrt_get_cart_page_url/product_page/product_edit from transactions.php
- Clean up aksrt_product_cat references in Coupon.php, PayCoupons.php

Shared payment/order/credits/content-pay stack fully retained.

inc/helpers/aksrt-transactions.php

@@ -17,41 +17,6 @@ function aksrt_get_order_status_labels(): array {
     return [];
 }
 
-function aksrt_get_product_page_view(int $product_id): array {
-    if ($product_id <= 0 || !class_exists('\AKSRT\Shop\Shop')) {
-        return [];
-    }
-
-    return \AKSRT\Shop\Shop::get_instance()->get_product_detail_view($product_id);
-}
-
-function aksrt_get_product_edit_page_view(int $user_id, int $product_id = 0): array {
-    if ($user_id <= 0 || !class_exists('\AKSRT\Shop\Shop')) {
-        return [
-            'allowed' => false,
-            'is_edit' => false,
-            'product' => [],
-        ];
-    }
-
-    return \AKSRT\Shop\Shop::get_instance()->get_product_edit_view($user_id, $product_id);
-}
-
-function aksrt_get_cart_page_view(int $user_id): array {
-    if ($user_id <= 0 || !class_exists('\AKSRT\Shop\Shop')) {
-        return [
-            'payment_methods' => [],
-            'shipping_methods' => [],
-            'address_book' => [],
-            'coupon_enabled' => false,
-            'currency_symbol' => '¥',
-            'pending_orders' => [],
-        ];
-    }
-
-    return \AKSRT\Shop\Shop::get_instance()->get_cart_page_view($user_id);
-}
-
 function aksrt_get_orders_page_view(int $user_id, int $paged = 1, int $per_page = 20, string $status = '', string $product_type = ''): array {
     $empty = [
         'items'         => [],
@@ -79,10 +44,6 @@ function aksrt_get_orders_page_view(int $user_id, int $paged = 1, int $per_page
         return \AKSRT\Payment\UserOrders::get_instance()->get_order_center_view($user_id, $args);
     }
 
-    if (class_exists('\AKSRT\Shop\Shop')) {
-        return \AKSRT\Shop\Shop::get_instance()->get_order_center_view($user_id, $args);
-    }
-
     return $empty;
 }
 
@@ -135,4 +96,4 @@ function aksrt_get_revenue_page_view(int $user_id): array {
         'total_withdrawn' => $total_withdrawn,
         'records'         => $records,
     ];
-}
+}