feat: registration and login with JWT auth

- users table: email, password_hash (bcrypt), role, is_active
- POST /auth/register — checks blocklist, hashes password, returns JWT
- POST /auth/login — verifies password, returns JWT
- Auth middleware: accepts env tokens (dev) OR valid JWTs
- end-user role → 403 Insufficient permissions on all /api/* routes
- JWT_SECRET + JWT_EXPIRES_IN env vars

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

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