* feat(mcp-server): add DRAWIO_BASE_URL env for private deployments
* Fix postMessage origin check and URL normalization
- Add getOrigin() function to extract scheme+host+port from DRAWIO_BASE_URL
- Use DRAWIO_ORIGIN for postMessage security check instead of full URL
- Add normalizeUrl() to remove trailing slash and avoid double slashes
- This fixes issues when users configure DRAWIO_BASE_URL with trailing slash or path
* feat: add MCP server package for npx distribution
- Self-contained MCP server with embedded HTTP server
- Real-time browser preview via draw.io iframe
- Tools: start_session, display_diagram, edit_diagram, get_diagram, export_diagram
- Port retry limit (6002-6020) and session TTL cleanup (1 hour)
- Published as @next-ai-drawio/mcp-server on npm
* chore: bump version to 0.1.2
* docs: add MCP server section to README (preview feature)
* docs: add multi-client installation instructions for MCP server
* fix: exclude packages from Next.js build
* docs: use @latest instead of -y flag for npx (match Playwright MCP style)
* chore: bump version to 0.4.3 and add release notes
* chore: remove release notes
* feat: add MCP server notice to example panel