Server endpoints were stored only in browser sessionStorage, lost on tab
close/refresh. Now endpoints are saved in a dedicated UCI config file
(wireguard_dashboard) with RPCD methods to manage them. The wizard
auto-saves the endpoint after tunnel creation, and peers/QR views use a
dropdown of saved endpoints instead of requiring manual re-entry.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
