Scaffold Regress: Fastify+SQLite server and Vue frontend for the Ingress-style BTC Map capture game

- Server: NIP-98 nostr auth (session cookies), BTC Map sync, claim/link/field
  routes, physical-presence checks via geolocation distance. 31 tests passing.
- Frontend: Leaflet map, team pick, claim/link UI, Archipelago identity
  bridge vendored (nostr-provider.js) for dashboard launch support.
- Verified end-to-end against the live BTC Map API (167 real Madeira places)
  and via genuine NIP-98-signed HTTP requests against the built app.

.env.example

@@ -0,0 +1,15 @@
+# Hostname or IP your users will reach this box on (no scheme, no port)
+PUBLIC_HOST=localhost
+
+# Where the Regress UI/API is reachable from browsers
+PUBLIC_URL=http://${PUBLIC_HOST}:8096
+
+# How close (meters) a player must physically be to a place to claim it or
+# link from it. Mirrors Ingress's "you must be at the portal" rule.
+CLAIM_RADIUS_METERS=40
+
+# BTC Map sync area — defaults to Madeira, Portugal (Funchal-centered).
+# See DESIGN.md for why this scope was chosen first.
+BTCMAP_CENTER_LAT=32.7607
+BTCMAP_CENTER_LON=-16.9595
+BTCMAP_RADIUS_KM=45