docs(seedbox): add README for Sonarr stack

seedbox/stacks/sonarr/README.md

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+# Sonarr Stack
+
+TV series management and automation.
+
+## Access
+
+- **URL**: https://sonarr.taila5ad8.ts.net
+- **Initial setup**: Configure on first access (no default credentials)
+
+## Ports
+
+| Port | Protocol | Exposure | Description |
+|------|----------|----------|-------------|
+| 8989 | TCP | Tailscale only | WebUI |
+
+## Volumes
+
+| Path in container | Host path | Description |
+|-------------------|-----------|-------------|
+| `/config` | Docker volume | Sonarr configuration |
+| `/downloads` | `/srv/seedbox/downloads` | Download directory |
+| `/media` | `/mnt/media` | Media library (NFS) |
+
+## Configuration
+
+### Root Folders
+
+1. Go to **Settings → Media Management → Root Folders**
+2. Add `/media/TV` or your preferred path
+
+### Download Client
+
+1. Go to **Settings → Download Clients → Add**
+2. Select "Transmission"
+3. Host: `transmission.taila5ad8.ts.net`
+4. Port: `443`
+5. Use SSL: ✅
+6. Username/Password: Your Transmission credentials
+
+### Connect to Prowlarr
+
+1. Go to **Settings → Indexers**
+2. Prowlarr will auto-sync indexers if configured correctly
+
+### Quality Profiles
+
+Configure in **Settings → Profiles** based on your preferences.
+
+## Troubleshooting
+
+```bash
+# Check logs
+docker logs sonarr
+
+# Check Tailscale sidecar
+docker exec ts-sonarr tailscale status
+
+# Restart stack
+cd /srv/seedbox/stacks/sonarr
+docker compose restart
+
+# Check WebUI is responding
+docker exec ts-sonarr curl -s http://127.0.0.1:8989
+```
+
+## Recommended Folder Structure
+
+```
+/mnt/media/
+├── TV/
+│   ├── Show Name (Year)/
+│   │   ├── Season 01/
+│   │   └── Season 02/
+│   └── Another Show/
+└── downloads/
+    └── completed/
+```
+
+## API Key
+
+Find your API key in **Settings → General → Security**.
+This is needed for Prowlarr integration.