feat(documents) : filesystem storage, server-side pagination and PDF compression

- Add DocumentStorageService for file-based storage (replaces Base64 in DB)
- Add DocumentServeController with /file and /download endpoints
- Add DocumentUploadProcessor using FormData + filesystem storage
- Add DocumentNormalizer exposing fileUrl/downloadUrl on all responses
- Add DocumentFileCleanupListener for automatic file deletion
- Add MigrateDocumentsToFilesystemCommand (Base64 → files, memory-safe)
- Add ApiFilter (SearchFilter, ExistsFilter, OrderFilter) on Document entity
- Add PdfCompressorService + refactor CompressPdfCommand for batch processing
- Fix TypeMachine PUT: deserialize=false + validate=false to prevent
  UniqueEntity false positive and writableLink collection interference
- Update CHANGELOG for v1.8.0
- Update frontend submodule

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

src/Controller/DocumentQueryController.php

@@ -112,7 +112,8 @@ class DocumentQueryController extends AbstractController
                 'id'          => $document->getId(),
                 'name'        => $document->getName(),
                 'filename'    => $document->getFilename(),
-                'path'        => $document->getPath(),
+                'fileUrl'     => '/api/documents/'.$document->getId().'/file',
+                'downloadUrl' => '/api/documents/'.$document->getId().'/download',
                 'mimeType'    => $document->getMimeType(),
                 'size'        => $document->getSize(),
                 'siteId'      => $document->getSite()?->getId(),