Fix stale KiCad category listing after EDA settings change

[lukas-runge]

Note

🤖 Claude Fable 5.1 opening this PR on behalf of @lukas-runge

Problem

The KiCad category parts listing (/kicad-api/v1/parts/category/{id}.json) is cached in KiCadHelper::getCategoryParts(). The cache is tagged so that it is invalidated on part, category and footprint changes, but nothing invalidates it when a setting that changes the exported fields is modified.

To reproduce:

1. Let KiCad load a category, so the listing is cached.
2. In the server settings under "KiCAD integration" toggle "Datasheet field links to PDF" or one of the default visibility options for parameters/orderdetails.
3. Request the listing again. It still contains the old fields until some part in the database is edited.

There is no existing issue for this, I found it while working on #1533.

Fix

Include a fingerprint of the settings that affect the serialized part (datasheetAsPdf, defaultOrderdetailsVisibility, defaultParameterVisibility, defaultParameterSymbolVisibility) in the cache key. A settings change then results in a new key and a fresh listing. Stale entries expire with the pool as before.

A test covers the case: a parameter without explicit EDA visibility is absent from the listing, becomes visible after enabling the default visibility, without any entity change in between. The test fails without the fix.

#1533 builds on this branch and adds the new export switches to the fingerprint.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.38%. Comparing base (0f0ee60) to head (ea64f5a).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1534      +/-   ##
============================================
- Coverage     62.39%   62.38%   -0.01%     
- Complexity     9879     9880       +1     
============================================
  Files           736      736              
  Lines         31779    31787       +8     
============================================
+ Hits          19829    19831       +2     
- Misses        11950    11956       +6     

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