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/Asset/Repositories/DatabaseAssetVariantRepositoryTest.php

@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Domain\Asset\Entities\AssetVariant;
+use App\Domain\Asset\Repositories\DatabaseAssetVariantRepository;
+use App\Domain\Asset\ValueObjects\AssetId;
+use App\Domain\Asset\ValueObjects\VariantName;
+use App\Framework\Database\ConnectionInterface;
+use App\Framework\Database\ResultInterface;
+
+describe('DatabaseAssetVariantRepository', function () {
+    beforeEach(function () {
+        $this->clock = new \App\Framework\DateTime\SystemClock();
+        $this->connection = Mockery::mock(ConnectionInterface::class);
+        $this->repository = new DatabaseAssetVariantRepository($this->connection);
+    });
+
+    it('saves variant to database', function () {
+        $assetId = AssetId::generate($this->clock);
+        $variant = AssetTestHelpers::createAssetVariant($assetId);
+
+        $this->connection->shouldReceive('execute')
+            ->once()
+            ->with(Mockery::type(\App\Framework\Database\ValueObjects\SqlQuery::class))
+            ->andReturn(1);
+
+        $this->repository->save($variant);
+    });
+
+    it('finds variants by asset id', function () {
+        $assetId = AssetId::generate($this->clock);
+        $row = [
+            'asset_id' => $assetId->toString(),
+            'variant' => '1200w.webp',
+            'bucket' => 'variants',
+            'key' => 'variants/2025/01/15/test/1200w.webp',
+            'mime' => 'image/webp',
+            'bytes' => 512,
+            'meta' => json_encode(['width' => 1200, 'height' => 675]),
+        ];
+
+        $result = Mockery::mock(ResultInterface::class);
+        $result->shouldReceive('fetchAll')
+            ->once()
+            ->andReturn([$row]);
+
+        $this->connection->shouldReceive('query')
+            ->once()
+            ->andReturn($result);
+
+        $found = $this->repository->findByAsset($assetId);
+
+        expect($found)->toBeArray();
+        expect($found)->toHaveCount(1);
+        expect($found[0])->toBeInstanceOf(AssetVariant::class);
+    });
+
+    it('finds specific variant by asset id and variant name', function () {
+        $assetId = AssetId::generate($this->clock);
+        $variantName = VariantName::fromString('1200w.webp');
+        $row = [
+            'asset_id' => $assetId->toString(),
+            'variant' => '1200w.webp',
+            'bucket' => 'variants',
+            'key' => 'variants/2025/01/15/test/1200w.webp',
+            'mime' => 'image/webp',
+            'bytes' => 512,
+            'meta' => json_encode(['width' => 1200, 'height' => 675]),
+        ];
+
+        $result = Mockery::mock(ResultInterface::class);
+        $result->shouldReceive('fetch')
+            ->once()
+            ->andReturn($row);
+
+        $this->connection->shouldReceive('query')
+            ->once()
+            ->andReturn($result);
+
+        $found = $this->repository->findByAssetAndVariant($assetId, $variantName);
+
+        expect($found)->toBeInstanceOf(AssetVariant::class);
+        expect($found->variant->equals($variantName))->toBeTrue();
+    });
+
+    it('deletes all variants for asset', function () {
+        $assetId = AssetId::generate($this->clock);
+
+        $this->connection->shouldReceive('execute')
+            ->once()
+            ->with(Mockery::type(\App\Framework\Database\ValueObjects\SqlQuery::class))
+            ->andReturn(1);
+
+        $this->repository->deleteByAsset($assetId);
+    });
+});
+