add cache to auth

package.json

@@ -5,7 +5,8 @@
   "main": "dist/index.js",
   "scripts": {
     "build": "tsc -p tsconfig.json",
-    "start": "tsc -w & node --watch --env-file=.env dist/index.js"
+    "start": "tsc -w & node --watch --env-file=.env dist/index.js",
+    "load_test": "export $(cat .env | xargs) && k6 run ./test/loadTest.js"
   },
   "keywords": [],
   "author": "",
@@ -22,12 +23,14 @@
     "fastify": "^5.2.0",
     "fastify-type-provider-zod": "^4.0.2",
     "fastify-zod": "^1.4.0",
+    "lru-cache": "^11.0.2",
     "mongoose": "^8.9.0",
     "zod": "^3.24.1"
   },
   "devDependencies": {
     "@types/bcrypt": "^5.0.2",
     "@types/node": "^22.10.2",
+    "k6": "^0.0.0",
     "typescript": "^5.7.2"
   }
 }