Add LoraBell app support and enhance package management in mock backend

- Introduced LoraBell as a static demo app in the mock backend, preventing its uninstallation.
- Merged static dev apps with Docker container data for improved package management.
- Updated app details and URLs for LoraBell in the Apps and AppDetails views.
- Enhanced the dummyApps utility to include LoraBell's configuration for consistent app representation.

DEMO-DEPLOY.md

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+# Demo Deployment via Portainer
+
+Deploy Archipelago with the **mock backend** for demos. No real node required.
+
+## Quick Deploy (Portainer)
+
+1. In Portainer: **Stacks** → **Add stack**
+2. Name: `archy-demo`
+3. **Web editor** → paste contents of `docker-compose.demo.yml`
+4. Or **Build from repository**: use this repo URL and set Compose path to `docker-compose.demo.yml`
+5. Deploy
+
+**Access:** http://your-host:4848
+
+## Mock Backend
+
+- Uses the Node.js mock backend (not the Rust backend)
+- Pre-loaded apps, fake data, simulated install/start/stop
+- **Login password:** `password123`
+
+## Port
+
+Default: **4848**. To change, edit the ports mapping in `docker-compose.demo.yml`:
+
+```yaml
+ports:
+  - "YOUR_PORT:80"
+```
+
+## Dev Mode
+
+`VITE_DEV_MODE=existing` skips setup/onboarding and goes straight to login. For other flows:
+
+- `setup` – Password setup screen first
+- `onboarding` – Experimental onboarding flow
+- `existing` – Login only (default for demo)