feat(archive): add zip converter with compression level and zip-slip protection

archiver v8 (installed) uses a class-based API (`ZipArchive`) rather than
the factory-function API most examples online still describe — adjusted
createZip() to match after the first test run surfaced the mismatch.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -17,6 +17,8 @@
   "dependencies": {
     "@phosphor-icons/react": "^2.1.10",
     "@prisma/client": "^6.19.3",
+    "adm-zip": "^0.6.0",
+    "archiver": "^8.0.0",
     "docx": "^9.7.1",
     "dotenv": "^17.4.2",
     "exceljs": "^4.4.0",