Use Fastify Mercurius and GraphQL contracts

package.json

@@ -9,19 +9,16 @@
     "start": "prisma migrate deploy && node dist/index.js"
   },
   "dependencies": {
-    "@apollo/server": "^5.5.1",
-    "@as-integrations/express5": "^1.1.2",
+    "@fastify/cors": "^11.2.0",
     "@prisma/adapter-pg": "^7.8.0",
     "@prisma/client": "^7.8.0",
     "@sentry/node": "^10.55.0",
-    "cors": "^2.8.6",
-    "express": "^5.2.1",
+    "fastify": "^5.8.5",
     "graphql": "^16.14.0",
+    "mercurius": "^16.9.0",
     "pg": "^8.21.0"
   },
   "devDependencies": {
-    "@types/cors": "^2.8.19",
-    "@types/express": "^5.0.6",
     "@types/node": "^25.9.1",
     "@types/pg": "^8.20.0",
     "prisma": "^7.8.0",