Tested KeyCloak validation - AUTH

Test Keycloak JWT validation against access token issued via NextAuth; ensure Spring Boot resource server correctly validates token signature, expiration, issuer, and optional audience.

frontend/package.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "next": "16.1.6",
+    "next-auth": "^4.24.13",
     "react": "19.2.3",
     "react-dom": "19.2.3"
   },