ver. 0.288: BasketCalculator + ShopBasketController migration, cms\Layout removal

- Migrate front\factory\ShopBasket → Domain\Basket\BasketCalculator (4 static methods, 18 callers updated)
- Migrate front\controls\ShopBasket → front\Controllers\ShopBasketController (camelCase, instance methods)
- Add snake_case→camelCase action dispatch for new controllers in Site::route()
- Update title()/page_title() to check front\Controllers\ before fallback
- Remove cms\Layout class (replaced by $layoutsRepo->find())
- Add 8 tests for BasketCalculator (484 tests, 1528 assertions)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

autoload/Domain/Basket/BasketCalculator.php

@@ -0,0 +1,62 @@
+<?php
+namespace Domain\Basket;
+
+class BasketCalculator
+{
+    public static function summaryWp($basket)
+    {
+        $wp = 0;
+        if (is_array($basket)) {
+            foreach ($basket as $product) {
+                $wp += $product['wp'] * $product['quantity'];
+            }
+        }
+        return $wp;
+    }
+
+    public static function countProductsText($count)
+    {
+        $count = (int)$count;
+        if ($count === 1) {
+            return $count . ' produkt';
+        }
+        if ($count >= 2 && $count <= 4) {
+            return $count . ' produkty';
+        }
+        return $count . ' produktów';
+    }
+
+    public static function summaryPrice($basket, $coupon = null)
+    {
+        global $lang_id;
+
+        $summary = 0;
+
+        if (is_array($basket)) {
+            foreach ($basket as $position) {
+                $product = \shop\Product::getFromCache((int)$position['product-id'], $lang_id);
+
+                $product_price_tmp = \shop\Product::calculate_basket_product_price(
+                    (float)$product['price_brutto_promo'],
+                    (float)$product['price_brutto'],
+                    $coupon,
+                    $position
+                );
+                $summary += $product_price_tmp['price_new'] * $position['quantity'];
+            }
+        }
+
+        return \Shared\Helpers\Helpers::normalize_decimal($summary);
+    }
+
+    public static function countProducts($basket)
+    {
+        $count = 0;
+        if (is_array($basket)) {
+            foreach ($basket as $product) {
+                $count += $product['quantity'];
+            }
+        }
+        return $count;
+    }
+}