- dav_router: add Basic-Auth principal-discovery tree at /caldav/ (and
/.well-known/caldav) so clients can add a CalDAV account with server URL +
username + password; lists all published calendars. Token URL /dav/{token}/
still works without login. Handlers generalised over a base href.
- dav_util: derive the public origin from X-Forwarded-Proto/-Host (or
PUBLIC_BASE_URL) so published URLs are https, not internal http:8080.
- local_router: expose caldav_login_url alongside caldav_url.
- frontend/i18n: show both the no-login token URL and the login URL + hint.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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