b3edf2c47b
Support Multiple API Base URLs With Fallback Make ApiClient accept multiple base URLs and try the next when responses indicate unavailability (408, 429, 502, 503, 504 or any >=500) or on network errors. Add fetchApi helper and selection logic, and use a Tailscale dev server as a fallback in the mobile service. Also update EventHeader to show a live leave-by countdown.