docs: improve Migration Guide and add TuneIn screenshot

Migration Guide step 1:
- Add 'Download pre-built binary' as the first option (no Go required)
- Add install-script option for Raspberry Pi / on-device deployments
- Move 'go install' to last (developer option)
- Add data/ directory callout: single directory to back up for a full restore

SoundTouch Service guide:
- Mention RadioBrowser alongside TuneIn in the BMX section
- Add soundtouch-web TuneIn search screenshot

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

docs/content/docs/guides/MIGRATION-GUIDE.md

@@ -23,15 +23,28 @@ For a shorter overview, see the [Survival Guide](SURVIVAL-GUIDE.md). For safety
 
 Choose the option that fits your setup.
 
-### Binary (go install)
+### Download a pre-built binary (no Go required)
+
+Download the latest release for your platform from the
+[GitHub releases page](https://github.com/gesellix/Bose-SoundTouch/releases).
+Unzip, make executable, and run:
 
 ```bash
-go install github.com/gesellix/bose-soundtouch/cmd/soundtouch-service@latest
-soundtouch-service
+# Linux / macOS example
+chmod +x soundtouch-service
+./soundtouch-service
 ```
 
 The service starts on port 8000. Open `http://localhost:8000` in your browser.
 
+### Install script (Raspberry Pi or on-device)
+
+A one-line installer handles download, installation as a system service, and
+auto-start on boot. See the
+[On-Device Install Walkthrough](ON-DEVICE-INSTALL-WALKTHROUGH.md) and
+[External Host Walkthrough](EXTERNAL-HOST-WALKTHROUGH.md) for the exact
+commands for each platform.
+
 ### Docker Compose (recommended for home servers and VMs)
 
 The repository ships a `docker-compose.yml` ready for this use case. Clone or download it, copy the example config, then edit `.env` before starting:
@@ -76,8 +89,17 @@ docker run -d \
 
 On macOS/Windows, device discovery via mDNS won't work inside the container — you'll add devices by IP address in Step 4.
 
+### go install (if you have Go installed)
+
+```bash
+go install github.com/gesellix/bose-soundtouch/cmd/soundtouch-service@latest
+soundtouch-service
+```
+
 See [Raspberry Pi Setup](RASPBERRY-PI.md) and the [SoundTouch Service Guide](SOUNDTOUCH-SERVICE.md) for more deployment options.
 
+> **Data directory**: all methods store device state, presets, and settings in a `data/` directory next to the binary (or mounted at `/app/data` in Docker). This directory is the single thing you need to back up — copying it is enough to restore a complete AfterTouch installation on a new machine.
+
 ---
 
 ## Step 2: Configure the service URL

docs/content/docs/guides/SOUNDTOUCH-SERVICE.md

@@ -28,10 +28,13 @@ The service consists of several key components:
 
 ### BMX Services (Bose Media eXchange)
 - **TuneIn Integration**: Direct playback of radio stations and podcasts
+- **RadioBrowser Integration**: Open community radio directory alongside TuneIn
 - **Custom Streams**: Flexible playback of any internet radio URL via dynamic proxy
 - **Service Registry**: Media service discovery and configuration
 - **Playback Control**: Stream URL resolution and audio metadata
 
+![soundtouch-web TuneIn search — browsing smooth jazz stations](/images/soundtouch-web-tunein.png)
+
 ### Marge Services (Account & Device Management)
 - **Account Management**: User account simulation and device association
 - **Preset Synchronization**: Cross-device preset storage and sync