ver. 0.293: Code review fixes — 6 repositories, 16 fixes

- ArticleRepository: SQL injection fix (addslashes→parameterized), DRY refactor topArticles/newsListArticles
- AttributeRepository: dead class_exists('\S') blocking cache/temp clear
- CategoryRepository: dead class_exists('\S') blocking SEO link generation (critical)
- BannerRepository: parameterize $today in SQL + null guard on query()
- BasketCalculator: null guard checkProductQuantityInStock + optional DI params
- PromotionRepository: null guard on $basket (production fatal)
- OrderRepository/ShopBasketController/ajax.php: explicit DI in BasketCalculator callers

614 tests, 1821 assertions (+4 new)

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

updates/changelog.php

@@ -1,3 +1,12 @@
+<b>ver. 0.293 - 19.02.2026</b><br />
+- FIX - ArticleRepository: SQL injection fix (addslashes→parameterized), uproszczenie articleDetailsFrontend
+- FIX - AttributeRepository: martwy class_exists('\S') blokowal czyszczenie cache/temp
+- FIX - CategoryRepository: martwy class_exists('\S') blokowal generowanie linkow SEO kategorii
+- FIX - BannerRepository: parametryzacja dat w SQL + null guard na query()
+- FIX - BasketCalculator: null guard checkProductQuantityInStock + opcjonalne DI params summaryPrice/calculateBasketProductPrice
+- FIX - PromotionRepository: null guard na $basket (produkcyjny fatal error)
+- UPDATE - OrderRepository, ShopBasketController, ajax.php: jawne DI zamiast globals w callerach BasketCalculator
+<hr>
 <b>ver. 0.292 - 18.02.2026</b><br />
 - UPDATE - pelna migracja front\factory\ do Domain (5 ostatnich klas: ShopProduct, ShopPaymentMethod, ShopPromotion, ShopStatuses, ShopTransport)
 - UPDATE - ProductRepository: ~20 nowych metod frontendowych (cache Redis, lazy loading, SKU/EAN fallback)