🔐 User Authentication and Database State Persistence

[shreyaa-hash]

Description

Currently, user preferences, target goals, learning progress, and readiness scores are stored entirely in the browser's localStorage (via the state manager in js/app.js). This means data is lost if the user clears their cache, and they cannot access their profile from different devices. We want to implement user login and save progress to a database.

Tasks for Contributors

• Implement user signup, login, and logout endpoints.
• Integrate JWT or OAuth (e.g., Google or GitHub login) for security.
• Design a database schema (MongoDB, PostgreSQL, or Firebase) to store user states (profile stats, completed roadmap checkpoints, interview attempts, and resume status).
• Update loadState() and saveState() functions in js/app.js to read/write state parameters to the server database rather than local browser storage.