feat: add class-validator && class-transformer

Author: aleksilassila

backend/package-lock.json

@@ -42,6 +42,8 @@
     "@nestjs/swagger": "^7.3.0",
     "@types/express-http-proxy": "^1.6.6",
     "cache-manager": "^5.7.6",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
     "express-http-proxy": "^2.0.0",
     "reflect-metadata": "^0.2.1",
     "rxjs": "^7.8.1",
@@ -101,4 +103,4 @@
     "packages/jellyfin.plugin",
     "packages/torrent-stream.plugin"
   ]
-}
+}