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/Languages/LanguagesRepository.php

@@ -332,6 +332,85 @@ class LanguagesRepository
         return $translationId;
     }
 
+    /**
+     * Zwraca ID domyslnego jezyka (z flaga start=1) z cache Redis.
+     */
+    public function defaultLanguage(): string
+    {
+        $cacheHandler = new \CacheHandler();
+        $cacheKey = 'Domain\Languages\LanguagesRepository::defaultLanguage';
+
+        $objectData = $cacheHandler->get($cacheKey);
+        if ($objectData) {
+            return unserialize($objectData);
+        }
+
+        $results = $this->db->query(
+            'SELECT id FROM pp_langs WHERE status = 1 ORDER BY start DESC, o ASC LIMIT 1'
+        )->fetchAll();
+
+        $defaultLanguage = $results[0][0] ?? 'pl';
+
+        $cacheHandler->set($cacheKey, $defaultLanguage);
+
+        return $defaultLanguage;
+    }
+
+    /**
+     * Zwraca liste aktywnych jezykow z cache Redis.
+     */
+    public function activeLanguages(): array
+    {
+        $cacheHandler = new \CacheHandler();
+        $cacheKey = 'Domain\Languages\LanguagesRepository::activeLanguages';
+
+        $objectData = $cacheHandler->get($cacheKey);
+        if ($objectData) {
+            return unserialize($objectData);
+        }
+
+        $activeLanguages = $this->db->select(
+            'pp_langs',
+            ['id', 'name'],
+            ['status' => 1, 'ORDER' => ['o' => 'ASC']]
+        );
+
+        if (!is_array($activeLanguages)) {
+            $activeLanguages = [];
+        }
+
+        $cacheHandler->set($cacheKey, $activeLanguages);
+
+        return $activeLanguages;
+    }
+
+    /**
+     * Zwraca tlumaczenia dla danego jezyka z cache Redis.
+     */
+    public function translations(string $language = 'pl'): array
+    {
+        $cacheHandler = new \CacheHandler();
+        $cacheKey = "Domain\Languages\LanguagesRepository::translations:$language";
+
+        $objectData = $cacheHandler->get($cacheKey);
+        if ($objectData) {
+            return unserialize($objectData);
+        }
+
+        $translations = ['0' => $language];
+
+        $results = $this->db->select('pp_langs_translations', ['text', $language]);
+        if (is_array($results)) {
+            foreach ($results as $row) {
+                $translations[$row['text']] = $row[$language];
+            }
+        }
+
+        $cacheHandler->set($cacheKey, $translations);
+
+        return $translations;
+    }
+
     private function sanitizeLanguageId(string $languageId): ?string
     {
         $languageId = strtolower(trim($languageId));