chore: update test durations

[github-actions]

Automated weekly refresh of src/backend/tests/.test_durations,
used by pytest-split to balance the 5 backend CI test groups.
A stale file causes unbalanced groups and group timeouts
("fails at 99%"), so this PR should be merged promptly.

This PR was automatically created by the store_pytest_durations
workflow. Durations were measured per CI group with the same test
selection CI uses (-n auto, no api_key_required, no
unit/template).

If the Validate PR check is missing, edit the PR title (e.g.
re-save it unchanged) or push to the branch to trigger it — PRs
created with the default GITHUB_TOKEN don't fire
pull_request_target workflows.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.68%. Comparing base (2433e87) to head (19c3192).
⚠️ Report is 22 commits behind head on main.

❌ Your project check has failed because the head coverage (54.62%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14154      +/-   ##
==========================================
+ Coverage   58.55%   58.68%   +0.13%     
==========================================
  Files        2306     2308       +2     
  Lines      221006   221079      +73     
  Branches    34264    34270       +6     
==========================================
+ Hits       129411   129745     +334     
+ Misses      90109    89853     -256     
+ Partials     1486     1481       -5     

Flag	Coverage Δ
backend	65.78% <ø> (-0.13%)	⬇️
frontend	57.88% <ø> (+0.23%)	⬆️
lfx	54.62% <ø> (-0.03%)	⬇️

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see 55 files with indirect coverage changes

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