v0.6.2-beta: Frontend Auth Render Hotfix

[DeepZone]

Motivation

• Fix a white-screen crash caused by violating React Hook Rules in frontend/src/App.tsx where a hook (useMemo) ran after conditional early returns.
• Provide a safe hotfix that ensures the auth bootstrap flow reliably renders setup/login/app states without React hook-order errors.
• Bump user-facing and runtime/package versions to v0.6.2-beta / 0.6.2 so UI and tests are consistent.

Description

• Removed useMemo from frontend/src/App.tsx and compute systemLine as a plain const before any early returns so no hooks are executed after conditional returns.
• Updated related UI/version strings in frontend/src/components/Layout.tsx and frontend/src/App.tsx to v0.6.2-beta.
• Bumped frontend package metadata in frontend/package.json and frontend/package-lock.json, and bumped backend/runtime version metadata in backend/app/main.py and backend/pyproject.toml.
• Synchronized backend API version strings and health/system status builders and test assertion with v0.6.2-beta in backend/app/api/routes_system.py, backend/app/api/routes_health.py, backend/app/core/system_status.py, and backend/tests/test_api_smoke.py, and added release notes in RELEASE_NOTES.md and README update.

Testing

• Ran cd frontend && npm run build and the frontend built successfully (Vite production build completed).
• Ran cd backend && pytest -q and backend tests passed (all tests passed in this run).
• Attempted docker compose checks but Docker is not available in this environment (docker: command not found).

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Codex Task