feat: add Control Room with containers and stacks management

- Add Control Room page with stacks sidebar and containers list
- Implement container actions (start/stop/restart) with snackbars
- Add container logs viewer dialog
- Add search/filter for both stacks and containers lists
- Add external links for Portainer and Netdata (url_launcher)
- Add VS Code launch configuration for Flutter web debugging

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pubspec.yaml

@@ -59,6 +59,9 @@ dependencies:
   # Icons
   cupertino_icons: ^1.0.8
 
+  # URL Launcher
+  url_launcher: ^6.3.1
+
 dev_dependencies:
   flutter_test:
     sdk: flutter