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This PR upgrades the mmdGenerator codebase to version 2.0.0.
Key improvements:
- Backend Performance: Refactored the database service to use a long-lived SQLite connection managed by a FastAPI lifespan handler. Added robust error handling.
- Frontend Quality: Shifted diagram exports (PNG/PDF) to the backend for better consistency. Optimized React components with memoization.
- Full QA Suite: Added backend unit tests for services/API and frontend E2E tests using Playwright.
- Release Ready: Bumped versions and tagged v2.0.0.