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/Domain/Scontainers/ScontainersRepository.php

@@ -215,11 +215,11 @@ class ScontainersRepository
 
     private function clearFrontCache(int $containerId): void
     {
-        if ($containerId <= 0 || !class_exists('\CacheHandler')) {
+        if ($containerId <= 0 || !class_exists('\Shared\Cache\CacheHandler')) {
             return;
         }
 
-        $cacheHandler = new \CacheHandler();
+        $cacheHandler = new \Shared\Cache\CacheHandler();
         $cacheKey = '\front\factory\Scontainers::scontainer_details:' . $containerId;
         $cacheHandler->delete($cacheKey);
     }