feat: add sentinel dashboard roadmap and fix deployment/linting issues

- Deliver `docs/sentinel-dashboard-master-plan.md` and `docs/roadmap.md` with implementation roadmap (2026-2035) and technical report plan.
- Fix Netlify configuration formatting (2-space indentation, single trailing newline) and synchronize across root and public folders.
- Refactor `backend/` JavaScript files (server.js, User.js) to adhere to Standard JS style and eliminate code duplication.
- Implement `deno.json` to properly scope Deno checks and exclude unrelated project directories from CI linting.
- Integrate systemic risk thresholds (StaR-MoE Alignment/Entropy) into the master plan monitors.

Co-authored-by: OneFineStarstuff <87420139+OneFineStarstuff@users.noreply.github.com>

Author: google-labs-jules[bot]