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/Support/AssetTestHelpers.php

@@ -0,0 +1,92 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Support;
+
+use App\Domain\Asset\Entities\Asset;
+use App\Domain\Asset\Entities\AssetTag;
+use App\Domain\Asset\Entities\AssetVariant;
+use App\Domain\Asset\ValueObjects\AssetId;
+use App\Domain\Asset\ValueObjects\AssetMetadata;
+use App\Domain\Asset\ValueObjects\VariantName;
+use App\Framework\Core\ValueObjects\FileSize;
+use App\Framework\Core\ValueObjects\Hash;
+use App\Framework\Core\ValueObjects\HashAlgorithm;
+use App\Framework\Core\ValueObjects\Timestamp;
+use App\Framework\DateTime\Clock;
+use App\Framework\Http\MimeType;
+use App\Framework\Storage\ValueObjects\BucketName;
+use App\Framework\Storage\ValueObjects\ObjectKey;
+
+final class AssetTestHelpers
+{
+    public static function createAsset(
+        Clock $clock,
+        ?AssetId $id = null,
+        ?BucketName $bucket = null,
+        ?ObjectKey $key = null,
+        ?MimeType $mime = null,
+        ?FileSize $bytes = null,
+        ?Hash $sha256 = null,
+        ?AssetMetadata $meta = null
+    ): Asset {
+        return new Asset(
+            id: $id ?? AssetId::generate($clock),
+            bucket: $bucket ?? BucketName::fromString('media'),
+            key: $key ?? ObjectKey::fromString('orig/2025/01/15/test.jpg'),
+            mime: $mime ?? MimeType::IMAGE_JPEG,
+            bytes: $bytes ?? FileSize::fromBytes(1024),
+            sha256: $sha256 ?? Hash::create('test-content', HashAlgorithm::SHA256),
+            meta: $meta ?? AssetMetadata::empty(),
+            createdAt: Timestamp::now()
+        );
+    }
+
+    public static function createAssetVariant(
+        AssetId $assetId,
+        ?VariantName $variant = null,
+        ?BucketName $bucket = null,
+        ?ObjectKey $key = null,
+        ?MimeType $mime = null,
+        ?FileSize $bytes = null,
+        ?AssetMetadata $meta = null
+    ): AssetVariant {
+        return new AssetVariant(
+            assetId: $assetId,
+            variant: $variant ?? VariantName::fromString('1200w.webp'),
+            bucket: $bucket ?? BucketName::fromString('variants'),
+            key: $key ?? ObjectKey::fromString('variants/2025/01/15/test/1200w.webp'),
+            mime: $mime ?? MimeType::IMAGE_WEBP,
+            bytes: $bytes ?? FileSize::fromBytes(512),
+            meta: $meta ?? AssetMetadata::fromArray(['width' => 1200, 'height' => 675])
+        );
+    }
+
+    public static function createAssetTag(
+        AssetId $assetId,
+        string $tag
+    ): AssetTag {
+        return new AssetTag(
+            assetId: $assetId,
+            tag: $tag
+        );
+    }
+
+    public static function createTestImageContent(): string
+    {
+        // Return a minimal valid JPEG header
+        return "\xFF\xD8\xFF\xE0\x00\x10JFIF\x00\x01\x01\x01\x00H\x00H\x00\x00\xFF\xD9";
+    }
+
+    public static function createAssetWithDimensions(
+        Clock $clock,
+        int $width,
+        int $height
+    ): Asset {
+        $meta = AssetMetadata::empty()->withDimensions($width, $height);
+
+        return self::createAsset($clock, meta: $meta);
+    }
+}
+