Replace Mapbox integration with custom Globe component

Switched from Mapbox to a custom globe visualization using 'cobe' library. Removed all Mapbox-related code, dependencies, and environmental variables. Introduced a WebSocket-based system to display live visitor data on the globe.

app/plugins/location.server.ts

@@ -0,0 +1,8 @@
+export default defineNuxtPlugin(() => {
+  const event = useRequestEvent()
+
+  useState('location', () => ({
+    latitude: event?.context.cf?.latitude || Math.random() * 180 - 90, // default to random latitude (only in dev)
+    longitude: event?.context.cf?.longitude || Math.random() * 360 - 180, // default to random longitude (only in dev)
+  }))
+})