ver. 0.287: Scontainers + ShopAttribute frontend migration to Domain

- Scontainers: frontScontainerDetails() with Redis cache in ScontainersRepository
- Scontainers: new front\Views\Scontainers VIEW, deleted factory + view legacy
- ShopAttribute: frontAttributeDetails(), frontValueDetails() with Redis cache in AttributeRepository
- ShopAttribute: clearFrontCache() per attribute/value + language
- ShopAttribute: deleted front\factory\ShopAttribute, updated 4 callers
- Tests: 476 OK, 1512 assertions (+6 frontend tests)

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

tests/Unit/Domain/Scontainers/ScontainersRepositoryTest.php

@@ -59,5 +59,40 @@ class ScontainersRepositoryTest extends TestCase
         $this->assertNull($repository->detailsForLanguage(0, 'pl'));
         $this->assertNull($repository->detailsForLanguage(1, ''));
     }
+
+    // ── Frontend methods tests ──────────────────────────────────
+
+    public function testFrontScontainerDetailsReturnsContainerWithLanguage(): void
+    {
+        $mockDb = $this->createMock(\medoo::class);
+        $mockDb->expects($this->exactly(2))
+            ->method('get')
+            ->willReturnOnConsecutiveCalls(
+                ['id' => 3, 'status' => 1, 'show_title' => 1],
+                ['container_id' => 3, 'lang_id' => 'pl', 'title' => 'Tytul', 'text' => 'Tekst']
+            );
+
+        $repository = new ScontainersRepository($mockDb);
+        $result = $repository->frontScontainerDetails(3, 'pl');
+
+        $this->assertIsArray($result);
+        $this->assertSame(3, (int)$result['id']);
+        $this->assertSame(1, (int)$result['status']);
+        $this->assertSame('Tytul', $result['languages']['title']);
+    }
+
+    public function testFrontScontainerDetailsReturnsFallbackForNotFound(): void
+    {
+        $mockDb = $this->createMock(\medoo::class);
+        $mockDb->method('get')->willReturn(null);
+
+        $repository = new ScontainersRepository($mockDb);
+        $result = $repository->frontScontainerDetails(999, 'pl');
+
+        $this->assertIsArray($result);
+        $this->assertSame(999, (int)$result['id']);
+        $this->assertSame(0, (int)$result['status']);
+        $this->assertSame('pl', $result['languages']['lang_id']);
+    }
 }