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/README.md

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+# Bordanlage – Boat Onboard System
+
+A complete multiroom audio + navigation dashboard system for boats.
+Runs on any Docker-capable computer – fully simulated in dev mode (no hardware needed).
+
+---
+
+## Prerequisites
+
+- [Docker Desktop](https://www.docker.com/products/docker-desktop/) (or Docker Engine + Compose)
+- `make`
+- For Spotify Connect: a Spotify Premium account
+
+---
+
+## Quick Start
+
+```bash
+cd bordanlage
+make dev
+```
+
+Dashboard: **http://localhost:8080**
+
+---
+
+## Service URLs
+
+| Service       | URL                          | Description                  |
+|---------------|------------------------------|------------------------------|
+| Dashboard     | http://localhost:8080        | Main touch UI                |
+| SignalK        | http://localhost:3000        | Navigation data + chart viewer |
+| Mopidy/Iris   | http://localhost:6680/iris/  | Music player UI               |
+| Snapcast Web  | http://localhost:1780        | Multiroom audio control       |
+| Jellyfin      | http://localhost:8096        | Media library                 |
+| Portainer     | http://localhost:9000        | Docker management             |
+
+---
+
+## Spotify Connect
+
+1. Run `make dev` (or `make boot` on the boat)
+2. Open Spotify on your phone/computer
+3. Tap the device icon (bottom right) → look for **"Bordanlage"**
+4. If it doesn't appear automatically: Go to **Connect to a Device** → enter the IP of the host machine manually
+
+> On Linux (boat): set `network_mode: host` for the `librespot` service in `docker-compose.yml` for reliable mDNS discovery.
+
+---
+
+## AirPlay
+
+1. Ensure the `shairport` container is running
+2. On your iPhone/Mac: open Control Center → tap AirPlay → select **"Bordanlage AirPlay"**
+
+> On Mac: AirPlay works natively via Bonjour.
+> On Windows WSL2: the `avahi` container in `docker-compose.dev.yml` handles mDNS.
+
+---
+
+## Adding Music
+
+Drop audio files into `./music/`. Mopidy and Jellyfin both mount this directory.
+
+Trigger a Mopidy library scan:
+```bash
+curl -s http://localhost:6680/mopidy/rpc -d '{"jsonrpc":"2.0","id":1,"method":"local.scan"}' \
+  -H "Content-Type: application/json"
+```
+
+For Jellyfin: open http://localhost:8096 → Settings → Libraries → Scan.
+
+---
+
+## Connecting Real NMEA Hardware
+
+Edit `docker-compose.yml` and uncomment the `signalk` device section:
+
+```yaml
+signalk:
+  devices:
+    - /dev/ttyUSB0:/dev/ttyUSB0  # NMEA 0183 via USB-Serial
+```
+
+Then configure the NMEA connection in SignalK at http://localhost:3000 → Server → Connections.
+
+For NMEA 2000: use a Yacht Devices YDNU-02 or similar USB gateway.
+
+---
+
+## Migration to Real Boat
+
+Changes needed in `docker-compose.yml`:
+
+1. **Audio output per zone**: add `--soundcard hw:N,0` to each `zone-*` command and uncomment `/dev/snd`
+2. **Spotify/AirPlay discovery**: set `network_mode: host` for `librespot` and `shairport`
+3. **Hardware video decoding** (optional): uncomment `/dev/dri` in `jellyfin`
+4. **NMEA hardware**: uncomment `/dev/ttyUSB0` in `signalk`
+5. Set `DEV=false` in `.env`
+
+Run `make boot` instead of `make dev`.
+
+---
+
+## Troubleshooting
+
+**Spotify device not showing up on Mac:**
+- Ensure port 57621 (UDP+TCP) is accessible. Docker Desktop on Mac sometimes blocks UDP.
+- Try connecting manually: Spotify → "Connect to a Device" → "Connect to [IP]"
+
+**AirPlay not visible on Windows:**
+- The `avahi` container requires D-Bus. Run Docker Desktop with host networking or use WSL2.
+
+**Snapcast zones show as offline:**
+- Audio pipes must exist before snapserver starts. Run `make pipes` or `bash scripts/init-pipes.sh`
+
+**Mopidy won't start:**
+- Check `docker compose logs mopidy`. The custom Dockerfile installs plugins on first build; rebuild with `make rebuild`
+
+**Dashboard shows "No signal":**
+- In dev mode this is normal until mock data initializes (1–2 seconds)
+- In production: check that SignalK is running and the WebSocket URL is correct in `.env`
+
+**Port conflicts:**
+- Edit the port mappings in `docker-compose.yml` or `docker-compose.dev.yml`