Auth Gateway Service

Build a Fastify API that acts as an authentication gateway. The service manages user sessions using JWT tokens.

Endpoints

• POST /api/auth/register -- Register a new user. Accepts email, password, and displayName. Stores the user in memory (hash the password with bcrypt or similar).
• POST /api/auth/login -- Authenticate a user. Accepts email and password. Returns a JWT access token.
• GET /api/auth/me -- Get the current user's profile. Requires a valid JWT in the Authorization header (Bearer token).
• POST /api/auth/logout -- Invalidate the current session (add token to a blocklist).

The JWT secret should come from an environment variable JWT_SECRET. Tokens should expire in 1 hour.

Protected routes (/me, /logout) should return 401 if no valid token is provided.

Output

Produce TypeScript files in a src/ directory:

• src/app.ts -- Fastify app setup
• src/plugins/auth.ts -- Authentication plugin with hooks and helpers
• src/plugins/users.ts -- User management routes
• src/services/userService.ts -- User storage and password hashing
• src/services/tokenService.ts -- JWT creation and verification
• src/server.ts -- Server startup

Do not include test files or build configuration.