refactor(frontend): migrate more apps to new config module

[Nixieboluo]

Caveats

DevBox

• DATABASE_URL env var is still needed.

[pull-request-size]

Whoa! Easy there, Partner!

This PR is too big. Please break it up into smaller PRs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.86%. Comparing base (a8ee367) to head (2efd5dc).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6775   +/-   ##
=======================================
  Coverage   61.86%   61.86%           
=======================================
  Files           8        8           
  Lines         653      653           
=======================================
  Hits          404      404           
  Misses        202      202           
  Partials       47       47           

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