fix(backend): add nanoid package for unique ID generation

Author: Lasim

package-lock.json

@@ -36,6 +36,7 @@
     "fastify": "^5.4.0",
     "fastify-favicon": "^5.0.0",
     "lucia": "^3.2.2",
+    "nanoid": "^3.3.11",
     "nodemailer": "^7.0.6",
     "pino": "^9.9.0",
     "pino-pretty": "^13.1.1",