ver. 0.282: Banners frontend migration, Cache cleanup, Shared\Cache namespace

- Banners frontend: front\Views\Banners (new), BannerRepository +2 frontend methods,
  front\view\Site przepięty, usunięte front\factory\Banners i front\view\Banners
- Cache cleanup: eliminacja legacy class.Cache.php (file-based cache),
  13 metod front\factory przepiętych z \Cache::fetch/store na CacheHandler
- Shared\Cache namespace: CacheHandler i RedisConnection przeniesione do Shared\Cache\,
  60 odwołań CacheHandler i 12 odwołań RedisConnection przepiętych,
  usunięte backward-compat wrappery class.CacheHandler.php i class.RedisConnection.php
- Naprawione rozbieżności kluczy cache (random_products, category_name)

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

autoload/shop/class.ProductAttribute.php

@@ -8,7 +8,7 @@ class ProductAttribute implements \ArrayAccess
   {
     global $mdb;
 
-    $cacheHandler = new \CacheHandler();
+    $cacheHandler = new \Shared\Cache\CacheHandler();
     $cacheKey = "\shop\ProductAttribute::is_value_default:$value_id";
 
     $objectData = $cacheHandler -> get( $cacheKey );
@@ -63,7 +63,7 @@ class ProductAttribute implements \ArrayAccess
   {
     global $mdb;
 
-    $cacheHandler = new \CacheHandler();
+    $cacheHandler = new \Shared\Cache\CacheHandler();
     $cacheKey = "\shop\ProductAttribute::get_attribute_order:$attribute_id";
 
     $objectData = $cacheHandler -> get( $cacheKey );
@@ -93,7 +93,7 @@ class ProductAttribute implements \ArrayAccess
   {
     global $mdb;
 
-    $cacheHandler = new \CacheHandler();
+    $cacheHandler = new \Shared\Cache\CacheHandler();
     $cacheKey = "\shop\ProductAttribute::get_value_name:$value_id:$lang_id";
 
     $objectData = $cacheHandler -> get( $cacheKey );