chore: remove unused packages

Author: Dragory

backend/package.json

@@ -69,13 +69,11 @@
     "utf-8-validate": "^5.0.5",
     "uuid": "^9.0.0",
     "vety": "1.0.0-rc2",
-    "yawn-yaml": "github:dragory/yawn-yaml#string-number-fix-build",
     "zod": "^4.1.12"
   },
   "devDependencies": {
     "@types/cors": "^2.8.5",
     "@types/express": "^4.16.1",
-    "@types/jest": "^24.0.15",
     "@types/js-yaml": "^3.12.1",
     "@types/lodash-es": "^4.17.12",
     "@types/multer": "^1.4.7",