Add ServerEntry model, load_servers/save_servers/set_default_server
to PlatformInterface with implementations for desktop (etcetera config),
web (localStorage), mobile (stub), and stub platforms. Implement
mumble_udp_ping protocol on desktop for direct server status queries.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Remove public_url config option
Use proxy_url instead for example configs
Get status from relative endpoint, like /config
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Reviewed-on: #5
Co-authored-by: Sam Sartor <me@samsartor.com>
Co-committed-by: Sam Sartor <me@samsartor.com>