refactor: cleanup backend code

[kmendell]

Checklist

• This PR is not opened from my fork’s main branch

What This PR Implements

Fixes:

Changes Made

Testing Done

• Development environment started: ./scripts/development/dev.sh start
• Frontend verified at http://localhost:3000
• Backend verified at http://localhost:3552
• Manual testing completed (describe):
• No linting errors (e.g., just lint all)
• Backend tests pass: just test backend

AI Tool Used (if applicable)

AI Tool:
Assistance Level:
What AI helped with:
I reviewed and edited all AI-generated output:
I ran all required tests and manually verified changes:

Additional Context

[kmendell]

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues

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[kmendell]

• refactor: cleanup backend code #2252 👈 (View in Graphite)
• main

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[getarcaneappbot]

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[github-actions]

This pull request has merge conflicts. Please resolve the conflicts so the PR can stay up-to-date and reviewed.