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>

tests/Unit/Domain/Basket/BasketCalculatorTest.php

@@ -0,0 +1,67 @@
+<?php
+namespace Tests\Unit\Domain\Basket;
+
+use PHPUnit\Framework\TestCase;
+use Domain\Basket\BasketCalculator;
+
+class BasketCalculatorTest extends TestCase
+{
+    public function testSummaryWpCalculatesTotal(): void
+    {
+        $basket = [
+            ['wp' => 2, 'quantity' => 3],
+            ['wp' => 5, 'quantity' => 1],
+        ];
+
+        $this->assertSame(11, BasketCalculator::summaryWp($basket));
+    }
+
+    public function testSummaryWpReturnsZeroForEmptyBasket(): void
+    {
+        $this->assertSame(0, BasketCalculator::summaryWp([]));
+        $this->assertSame(0, BasketCalculator::summaryWp(null));
+    }
+
+    public function testCountProductsSumsQuantities(): void
+    {
+        $basket = [
+            ['quantity' => 2],
+            ['quantity' => 3],
+            ['quantity' => 1],
+        ];
+
+        $this->assertSame(6, BasketCalculator::countProducts($basket));
+    }
+
+    public function testCountProductsReturnsZeroForEmptyBasket(): void
+    {
+        $this->assertSame(0, BasketCalculator::countProducts([]));
+        $this->assertSame(0, BasketCalculator::countProducts(null));
+    }
+
+    public function testCountProductsTextSingular(): void
+    {
+        $this->assertSame('1 produkt', BasketCalculator::countProductsText(1));
+    }
+
+    public function testCountProductsTextPlural2to4(): void
+    {
+        $this->assertSame('2 produkty', BasketCalculator::countProductsText(2));
+        $this->assertSame('3 produkty', BasketCalculator::countProductsText(3));
+        $this->assertSame('4 produkty', BasketCalculator::countProductsText(4));
+    }
+
+    public function testCountProductsTextPlural5Plus(): void
+    {
+        $this->assertSame('0 produktów', BasketCalculator::countProductsText(0));
+        $this->assertSame('5 produktów', BasketCalculator::countProductsText(5));
+        $this->assertSame('12 produktów', BasketCalculator::countProductsText(12));
+        $this->assertSame('100 produktów', BasketCalculator::countProductsText(100));
+    }
+
+    public function testCountProductsTextCastsToInt(): void
+    {
+        $this->assertSame('3 produkty', BasketCalculator::countProductsText('3'));
+        $this->assertSame('0 produktów', BasketCalculator::countProductsText('abc'));
+    }
+}