Replace username/password authentication with FIDO2/WebAuthn passkey-based
auth using webauthn-rs. Sessions and bearer tokens are unchanged — only the
way they are created changes.
- Add webauthn-rs, uuid, open, url deps; remove argon2, rpassword
- Add passkey_credentials and registration_tokens tables (migrations 17-18)
- Add domain entities, typed IDs, and repository traits for passkeys/tokens
- Add SQL repository implementations for passkeys and registration tokens
- Add ChallengeStore for in-memory WebAuthn ceremony state
- Add WebAuthn route handlers (register/auth start+finish ceremonies)
- Add CLI browser handoff for token creation (opens browser, local callback)
- Replace login form with "Sign in with Passkey" button
- Add registration page for first-user bootstrap via one-time token
- Replace BREWLOG_ADMIN_USERNAME/PASSWORD with BREWLOG_RP_ID/RP_ORIGIN
- Change default BREWLOG_URL from 127.0.0.1 to localhost (WebAuthn requires it)
- Add tower and tower-cookies dependencies for session management
- Create login page template with username/password form
- Implement /login and /logout routes with cookie-based sessions
- Update navigation bar to show Login/Logout based on auth state
- Add is_authenticated field to all page templates
- Hide create/update/delete UI controls when unauthenticated
- Session tokens stored in secure HttpOnly cookies with SameSite=Lax
- Password verification uses constant-time comparison via Argon2
Co-authored-by: jnsgruk <668505+jnsgruk@users.noreply.github.com>
