docs(seedbox): add README for Prowlarr stack

seedbox/stacks/prowlarr/README.md

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+# Prowlarr Stack
+
+Indexer manager for Sonarr, Radarr, and other *arr applications.
+
+## Access
+
+- **URL**: https://prowlarr.taila5ad8.ts.net
+- **Initial setup**: Configure on first access (no default credentials)
+
+## Ports
+
+| Port | Protocol | Exposure | Description |
+|------|----------|----------|-------------|
+| 9696 | TCP | Tailscale only | WebUI |
+
+## Features
+
+- Centralized indexer management
+- Automatic sync with Sonarr/Radarr
+- Support for Usenet and Torrent indexers
+- Built-in indexer testing
+
+## Configuration
+
+### Connect to Sonarr
+
+1. In Prowlarr: **Settings → Apps → Add**
+2. Select "Sonarr"
+3. Prowlarr Server: `http://localhost:9696` (or use Tailscale hostname)
+4. Sonarr Server: `http://sonarr.taila5ad8.ts.net` or internal Docker network
+5. API Key: Get from Sonarr **Settings → General**
+
+### Add Indexers
+
+1. Go to **Indexers → Add**
+2. Search for your preferred indexer
+3. Configure credentials if required
+4. Test and save
+
+## Troubleshooting
+
+```bash
+# Check logs
+docker logs prowlarr
+
+# Check Tailscale sidecar
+docker exec ts-prowlarr tailscale status
+
+# Restart stack
+cd /srv/seedbox/stacks/prowlarr
+docker compose restart
+
+# Check WebUI is responding
+docker exec ts-prowlarr curl -s http://127.0.0.1:9696
+```
+
+## Integration Notes
+
+Prowlarr can communicate with other *arr apps via:
+1. **Tailscale hostnames** (e.g., `sonarr.taila5ad8.ts.net`) - Recommended
+2. **Docker network** - Requires additional network configuration