feat: implement user generation tracking and GitHub star validation for license key generation

- Added UserGeneration model to track user license generation counts and statuses.
- Introduced validateStar utility to check if a user has starred the project on GitHub.
- Updated license key generation endpoint to validate user star status and manage generation limits.
- Refactored server.js to handle new user generation logic and improved error handling.

server/package.json

@@ -18,6 +18,5 @@
   },
   "devDependencies": {
     "nodemon": "^3.0.2"
-  },
-  "packageManager": "pnpm@9.14.2+sha512.6e2baf77d06b9362294152c851c4f278ede37ab1eba3a55fda317a4a17b209f4dbb973fb250a77abc463a341fcb1f17f17cfa24091c4eb319cda0d9b84278387"
+  }
 }