feat(auth): add user schema and auth api

.env.example

@@ -0,0 +1,8 @@
+PORT=3000
+NODE_ENV=development
+MONGODB_URI=mongodb://localhost:27017/noctune
+JWT_SECRET=isi_random_string_panjang
+JWT_REFRESH_SECRET=isi_random_string_lain
+JWT_EXPIRES_IN=15m
+JWT_REFRESH_EXPIRES_IN=7d
+CLIENT_URL=http://localhost:5173