[medium] adsb.lol military feed depends on the Vite dev proxy

[MeyerThorsten]

Severity: medium
Category: bug

The default adsblol military source is wired to a dev-only Vite proxy path, so it works under vite dev but not under preview or static production hosting.

Evidence:

• src/layers/military-layer.ts:22 sets the source URL to /proxy/adsb-mil.
• src/layers/military-layer.ts:406-412 fetches that path directly for the default adsblol source.
• vite.config.ts:24-33 defines /proxy/adsb-mil only inside the Vite dev server proxy.

Impact:

• the default military feed fails outside the dev server
• users see avoidable fetch errors and reduced military coverage in preview and production
• the app behavior differs materially between development and deployment

Recommended fix:

• move the proxy to the Express backend, or
• replace the dev-only path with a production-backed endpoint that exists in every environment