Gap closure: frontend auth+parity, Flask NAS UI landed, mypy zero, BLE001 policy, canary green, release+backup - #45

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-python@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/