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/scripts/setup-dev.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -e
+
+echo "Setting up development environment..."
+
+# Copy .env if not exists
+if [ ! -f .env ]; then
+  cp .env.example .env
+  echo "Created .env from .env.example"
+fi
+
+# Create music directory
+mkdir -p music
+echo "Music directory: ./music (drop your files here)"
+
+# Init pipes
+bash scripts/init-pipes.sh
+
+echo ""
+echo "Done! Run 'make dev' to start all services."
+echo "Dashboard: http://localhost:8080"