Old logout() was demo placeholder:
- only cleared 'app-role' + 'jwt' (NOT pgz_access/refresh/user)
- did NOT call POST /auth/logout to revoke JWT
- redirected to /static/sport2.html (wrong)
New logout() now:
1. POST /auth/logout to revoke JWT server-side
2. Clear ALL keys: pgz_access, pgz_refresh, pgz_user, app-role, jwt, access_token, refresh_token, pgz_session_id (both localStorage + sessionStorage)
3. Redirect to /login
Verified by Playwright E2E: token absent after logout.
