feat(cms,asset): add comprehensive test suite and finalize modules

- Add comprehensive test suite for CMS and Asset modules using Pest Framework
- Implement ContentTypeService::delete() protection against deletion of in-use content types
- Add CannotDeleteContentTypeInUseException for better error handling
- Fix DerivatPipelineRegistry::getAllPipelines() to handle object uniqueness correctly
- Fix VariantName::getScale() to correctly parse scales with file extensions
- Update CMS module documentation with new features, exceptions, and test coverage
- Add CmsTestHelpers and AssetTestHelpers for test data factories
- Fix BlockTypeRegistry to be immutable after construction
- Update ContentTypeService to check for associated content before deletion
- Improve BlockRendererRegistry initialization

Test coverage:
- Value Objects: All CMS and Asset value objects
- Services: ContentService, ContentTypeService, SlugGenerator, BlockValidator, ContentLocalizationService, AssetService, DeduplicationService, MetadataExtractor
- Repositories: All database repositories with mocked connections
- Rendering: Block renderers and ContentRenderer
- Controllers: API endpoints for both modules

254 tests passing, 38 remaining (mostly image processing pipeline tests)

tests/Unit/Domain/Cms/Repositories/DatabaseContentTranslationRepositoryTest.php

@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Domain\Cms\Entities\ContentTranslation;
+use App\Domain\Cms\Repositories\DatabaseContentTranslationRepository;
+use App\Domain\Cms\ValueObjects\ContentId;
+use App\Domain\Cms\ValueObjects\Locale;
+use App\Framework\Database\ConnectionInterface;
+use App\Framework\Database\ResultInterface;
+use Tests\Support\CmsTestHelpers;
+
+describe('DatabaseContentTranslationRepository', function () {
+    beforeEach(function () {
+        $this->clock = new \App\Framework\DateTime\SystemClock();
+        $this->connection = Mockery::mock(ConnectionInterface::class);
+        $this->repository = new DatabaseContentTranslationRepository($this->connection);
+    });
+
+    it('saves translation to database', function () {
+        $contentId = ContentId::generate($this->clock);
+        $translation = CmsTestHelpers::createContentTranslation($contentId);
+
+        $this->connection->shouldReceive('execute')
+            ->once()
+            ->with(Mockery::type(\App\Framework\Database\ValueObjects\SqlQuery::class))
+            ->andReturn(1);
+
+        $this->repository->save($translation);
+    });
+
+    it('finds translation by content id and locale', function () {
+        $contentId = ContentId::generate($this->clock);
+        $locale = Locale::german();
+        $row = [
+            'content_id' => $contentId->toString(),
+            'locale' => 'de',
+            'title' => 'Deutscher Titel',
+            'blocks' => json_encode([['id' => 'hero-1', 'type' => 'hero', 'data' => ['title' => 'Hero']]]),
+            'created_at' => '2025-01-15 10:00:00',
+            'updated_at' => '2025-01-15 10:00:00',
+        ];
+
+        $result = Mockery::mock(ResultInterface::class);
+        $result->shouldReceive('fetch')
+            ->once()
+            ->andReturn($row);
+
+        $this->connection->shouldReceive('query')
+            ->once()
+            ->andReturn($result);
+
+        $found = $this->repository->findByContentAndLocale($contentId, $locale);
+
+        expect($found)->toBeInstanceOf(ContentTranslation::class);
+        expect($found->locale->equals($locale))->toBeTrue();
+    });
+
+    it('finds all translations for content', function () {
+        $contentId = ContentId::generate($this->clock);
+        $row = [
+            'content_id' => $contentId->toString(),
+            'locale' => 'de',
+            'title' => 'Deutscher Titel',
+            'blocks' => json_encode([['id' => 'hero-1', 'type' => 'hero', 'data' => ['title' => 'Hero']]]),
+            'created_at' => '2025-01-15 10:00:00',
+            'updated_at' => '2025-01-15 10:00:00',
+        ];
+
+        $result = Mockery::mock(ResultInterface::class);
+        $result->shouldReceive('fetchAll')
+            ->once()
+            ->andReturn([$row]);
+
+        $this->connection->shouldReceive('query')
+            ->once()
+            ->andReturn($result);
+
+        $found = $this->repository->findByContent($contentId);
+
+        expect($found)->toBeArray();
+        expect($found)->toHaveCount(1);
+    });
+
+    it('deletes translation', function () {
+        $contentId = ContentId::generate($this->clock);
+        $locale = Locale::german();
+
+        $this->connection->shouldReceive('execute')
+            ->once()
+            ->with(Mockery::type(\App\Framework\Database\ValueObjects\SqlQuery::class))
+            ->andReturn(1);
+
+        $this->repository->delete($contentId, $locale);
+    });
+});
+