Adds bcrypt password hashing, JWT access/refresh token generation, requireAuth middleware, and /api/auth routes (POST /register, POST /login, POST /refresh, GET /me). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds bcrypt password hashing, JWT access/refresh token generation, requireAuth middleware, and /api/auth routes (POST /register, POST /login, POST /refresh, GET /me). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>