chore(deps): Update dependencies across packages

This commit updates several dependencies in the frontend and backend packages.

- **Backend:**
  - Upgrades `xlsx` to version `0.20.3` by pointing to the official CDN URL. This ensures usage of the community edition with a permissive license.
  - Removes the unused `bull-board` development dependency.

- **Frontend:**
  - Upgrades `@sveltejs/kit` from `^2.16.0` to `^2.38.1` to stay current with the latest features and fixes.

.github/ISSUE_TEMPLATE/bug_report.md

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.github/ISSUE_TEMPLATE/feature_request.md

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