Initial implementation: Bordanlage boat onboard system

Complete multiroom audio + navigation dashboard:
- Docker stack: SignalK, Snapcast (4 zones), librespot, shairport-sync, Mopidy, Jellyfin, Portainer
- React 18 + Vite dashboard with nautical dark theme
- Full mock system (SignalK NMEA simulation, Snapcast zones, Mopidy player)
- Real API clients for all services with reconnect logic
- SVG instruments: Compass, WindRose, Gauge, DepthSounder, SpeedLog
- Pages: Overview, Navigation, Audio (zones/radio/library), Systems
- Dev mode runs fully without hardware (make dev)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bordanlage/Makefile

@@ -0,0 +1,22 @@
+.PHONY: dev boot stop logs rebuild status pipes
+
+dev: pipes
+	docker compose -f docker-compose.yml -f docker-compose.dev.yml up -d
+
+boot: pipes
+	docker compose up -d
+
+stop:
+	docker compose down
+
+logs:
+	docker compose logs -f
+
+rebuild:
+	docker compose build --no-cache
+
+status:
+	docker compose ps
+
+pipes:
+	@bash scripts/init-pipes.sh