Implement Wallet-Based Authentication (Auth Module MVP)

[phertyameen]

Set up the auth module to support wallet-based authentication. Users should log in by signing a message with their wallet (MetaMask, WalletConnect, etc.), and the backend will verify the signature. A JWT will be returned to maintain the session.

Tasks:

Install ethers.js (or viem) for signature verification.

Create AuthController with endpoints:

POST /auth/request-message → returns nonce for signature.

POST /auth/verify → verifies signed message, returns JWT.

Store nonces temporarily in Redis to prevent replay attacks.

Configure JWT strategy in NestJS (Passport + JWT).

Protect routes using AuthGuard.

Acceptance Criteria:

✅ Users can log in by signing a message.

✅ Server verifies ownership of wallet address.

✅ JWT is issued and used to access protected routes.

Attach a sample request to the test on pr submit