Add configurable deployment system with VPN and Tor support

Features:
- Hidden config.json in assets for per-deployment customization
- Configure target URL, app name, and branding
- Optional WireGuard VPN with auto-connect
- Optional Tor routing via Orbot
- Custom theme colors
- Configuration-driven app behavior

Configuration file location: app/src/main/assets/config.json
Example configuration: config.example.json

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/src/main/assets/config.json

@@ -0,0 +1,7 @@
+{
+  "appName": "SilverDesk Staging",
+  "appVersion": "1.0.0",
+  "targetUrl": "https://silverdesk-staging.silverlabs.uk/",
+  "showUrlBar": false,
+  "allowNavigation": true
+}