Add environment configuration and local development documentation

- Parameterize CORS_ORIGINS in docker-compose.swarm.yml
- Add .env.example with configuration options
- Create comprehensive LOCAL_DEVELOPMENT.md guide
- Update README.md with environment variable documentation
- Provide alternatives for local development without production domain

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

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

frontend/node_modules/.package-lock.json

@@ -1456,7 +1456,6 @@
         "x64"
       ],
       "dev": true,
-      "ideallyInert": true,
       "license": "MIT",
       "optional": true,
       "os": [