Use Fastify Mercurius and GraphQL contracts

package.json

@@ -9,19 +9,17 @@
     "start": "prisma migrate deploy && node dist/index.js"
   },
   "dependencies": {
-    "@apollo/server": "^4.11.3",
+    "@fastify/cors": "^11.2.0",
     "@prisma/client": "^6.5.0",
     "@sentry/node": "^9.5.0",
-    "cors": "^2.8.5",
-    "express": "^4.21.2",
+    "fastify": "^5.8.5",
     "graphql": "^16.10.0",
     "graphql-tag": "^2.12.6",
     "jose": "^6.0.11",
+    "mercurius": "^16.9.0",
     "mongodb": "^6.13.0"
   },
   "devDependencies": {
-    "@types/cors": "^2.8.17",
-    "@types/express": "^5.0.0",
     "@types/node": "^22.13.0",
     "prisma": "^6.5.0",
     "tsx": "^4.19.0",