ver. 0.278: Settings + Languages frontend migration, bug fix get_single_settings_value

- Add cached frontend methods to existing Domain repositories (allSettings, getSingleValue, defaultLanguage, activeLanguages, translations)
- Convert front\factory\Settings and Languages to facades delegating to Domain repositories
- Fix get_single_settings_value() - was hardcoded to 'firm_name', now uses $param correctly
- Add CacheHandler stub methods (get/set/exists) to test bootstrap
- Establish architectural rule: Domain classes are shared between admin and frontend

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

autoload/Domain/Settings/SettingsRepository.php

@@ -2,7 +2,7 @@
 namespace Domain\Settings;
 
 /**
- * Repozytorium ustawien panelu administratora.
+ * Repozytorium ustawien — wspolne dla admin i frontendu.
  */
 class SettingsRepository
 {
@@ -141,6 +141,58 @@ class SettingsRepository
         return $settings;
     }
 
+    /**
+     * Pobranie wszystkich ustawien z cache Redis.
+     *
+     * @param bool $skipCache Pomija cache (np. przy generowaniu htaccess)
+     */
+    public function allSettings(bool $skipCache = false): array
+    {
+        $cacheHandler = new \CacheHandler();
+        $cacheKey = 'Domain\Settings\SettingsRepository::allSettings';
+
+        if (!$skipCache) {
+            $objectData = $cacheHandler->get($cacheKey);
+            if ($objectData) {
+                return unserialize($objectData);
+            }
+        }
+
+        $results = $this->db->select('pp_settings', '*');
+        $settings = [];
+
+        if (is_array($results)) {
+            foreach ($results as $row) {
+                $settings[$row['param']] = $row['value'];
+            }
+        }
+
+        $cacheHandler->set($cacheKey, $settings);
+
+        return $settings;
+    }
+
+    /**
+     * Pobranie pojedynczej wartosci ustawienia po nazwie parametru.
+     */
+    public function getSingleValue(string $param): string
+    {
+        $cacheHandler = new \CacheHandler();
+        $cacheKey = "Domain\Settings\SettingsRepository::getSingleValue:$param";
+
+        $objectData = $cacheHandler->get($cacheKey);
+        if ($objectData) {
+            return unserialize($objectData);
+        }
+
+        $value = $this->db->get('pp_settings', 'value', ['param' => $param]);
+        $value = (string)($value ?? '');
+
+        $cacheHandler->set($cacheKey, $value);
+
+        return $value;
+    }
+
     private function isEnabled($value): bool
     {
         if (is_bool($value)) {