feat: Add Docker config, Gitea workflow, and map improvements

- Add Dockerfile, nginx.conf, docker-compose.yml
- Add Gitea Actions workflow
- Improve map mobile UX (safe area, no pull-to-refresh)
- Persist map state (zoom, center, layer) to localStorage
- Add Google Hybrid map layer
- Configure Vite for Cloudflare tunnel

.dockerignore

@@ -0,0 +1,5 @@
+node_modules
+dist
+.git
+.vscode
+.DS_Store