Add central live map backend: chunk/player ingest, Vantage sidecar supervisor and proxy

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DjMbLQujBHunCCu5GpsHaT

panel/server/src/state.rs

@@ -13,4 +13,5 @@ pub struct AppState {
     pub ygg: Arc<crate::yggdrasil::keys::Keys>,
     pub http: reqwest::Client,
     pub login_guard: Arc<LoginGuard>,
+    pub livemap: Arc<crate::livemap::LiveMap>,
 }