Add the second half of the password reset flow: /password/confirm API
endpoint with token validation, transactional password update, and a
frontend confirm-password-reset-page with proper error handling for
expired/used tokens. Updates generated SDK/client bindings.
- Add workspace_my_pending_invitations() for listing pending invites
- Add workspace_accept_invitation_by_slug() to accept by slug without token
- Register new routes: GET /workspaces/me/invitations, POST /workspaces/invitations/accept-by-slug