- Upgrade from Leaflet to MapLibre GL JS 4.7.1 with OpenFreeMap dark base
- Add submarine cable layer (TeleGeography via /api/submarine-cables proxy, 24h cache)
- Add global datacenter layer (PeeringDB all facilities via /api/global-infra proxy)
- Layer toggles: ASN PoPs | Submarine Cables | Global Datacenters
- Dark-themed popup styling matching PeerCortex UI
- Server-side caching for both new data sources (24h TTL)
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