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/Shared/Cache/CacheHandler.php

@@ -0,0 +1,60 @@
+<?php
+namespace Shared\Cache;
+
+class CacheHandler
+{
+    protected $redis;
+
+    public function __construct()
+    {
+        if (class_exists('Redis')) {
+            try {
+                $this->redis = RedisConnection::getInstance()->getConnection();
+            } catch (\Exception $e) {
+                $this->redis = null;
+            }
+        }
+    }
+
+    public function get($key)
+    {
+        if ($this->redis) {
+            return $this->redis->get($key);
+        }
+        return null;
+    }
+
+    public function set($key, $value, $ttl = 86400)
+    {
+        if ($this->redis) {
+            $this->redis->setex($key, $ttl, serialize($value));
+        }
+    }
+
+    public function exists($key)
+    {
+        if ($this->redis) {
+            return $this->redis->exists($key);
+        }
+        return false;
+    }
+
+    public function delete($key)
+    {
+        if ($this->redis) {
+            return $this->redis->del($key);
+        }
+        return false;
+    }
+
+    public function deletePattern($pattern)
+    {
+        if ($this->redis) {
+            $keys = $this->redis->keys($pattern);
+            if (!empty($keys)) {
+                return $this->redis->del($keys);
+            }
+        }
+        return false;
+    }
+}

autoload/Shared/Cache/RedisConnection.php

@@ -0,0 +1,45 @@
+<?php
+namespace Shared\Cache;
+
+class RedisConnection
+{
+    private static $instance = null;
+    private $redis;
+
+    private function __construct()
+    {
+        global $config;
+
+        $this->redis = new \Redis();
+
+        try {
+            if (!$this->redis->connect($config['redis']['host'], $config['redis']['port'])) {
+                error_log("Nie udalo sie polaczyc z serwerem Redis.");
+                $this->redis = null;
+                return;
+            }
+
+            if (!$this->redis->auth($config['redis']['password'])) {
+                error_log("Autoryzacja do serwera Redis nie powiodla sie.");
+                $this->redis = null;
+                return;
+            }
+        } catch (\Exception $e) {
+            error_log("Blad podczas polaczenia z Redis: " . $e->getMessage());
+            $this->redis = null;
+        }
+    }
+
+    public static function getInstance()
+    {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+
+    public function getConnection()
+    {
+        return $this->redis;
+    }
+}