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>

tests/Unit/Domain/Cache/CacheRepositoryTest.php

@@ -20,7 +20,7 @@ class CacheRepositoryTest extends TestCase
         $mockRedis = $this->createMock(\Redis::class);
         $mockRedis->expects($this->once())->method('flushAll')->willReturn(true);
 
-        $mockRedisConnection = $this->createMock(\RedisConnection::class);
+        $mockRedisConnection = $this->createMock(\Shared\Cache\RedisConnection::class);
         $mockRedisConnection->expects($this->once())->method('getConnection')->willReturn($mockRedis);
 
         $repository = new CacheRepository($mockRedisConnection);
@@ -36,7 +36,7 @@ class CacheRepositoryTest extends TestCase
      */
     public function testClearCacheRedisUnavailable(): void
     {
-        $mockRedisConnection = $this->createMock(\RedisConnection::class);
+        $mockRedisConnection = $this->createMock(\Shared\Cache\RedisConnection::class);
         $mockRedisConnection->expects($this->once())->method('getConnection')->willReturn(null);
 
         $repository = new CacheRepository($mockRedisConnection);