Add Factorio World Management feature to GSM

- Add gsm-frontend to repository (React + Vite + TailwindCSS)
- New "Worlds" tab for Factorio server with:
  - List saved worlds with Start/Delete actions
  - Create new world with full map generation parameters
  - Preset selection (Default, Rich Resources, Rail World, etc.)
  - Save custom configurations as templates
- Show which save will be loaded in Overview tab
- Lock world management while server is running
- Backend changes deployed to server separately

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

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

gsm-frontend/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?