fix: pass missing query params in findAllPerAuthor to findAllFlat

[mlewandowski904]

Ticket

#394

Summary

Fix findAllPerAuthor not forwarding omit, locale, limit, and skip params to findAllFlat, causing features like field omission and locale filtering to silently not work

[codecov]

Codecov Report

❌ Patch coverage is 97.22222% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.98%. Comparing base (96b1701) to head (fc7b5a6).

Files with missing lines	Patch %	Lines
server/src/services/common.service.ts	97.22%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #397      +/-   ##
==========================================
+ Coverage   93.69%   93.98%   +0.29%     
==========================================
  Files          39       39              
  Lines        1062     1081      +19     
  Branches      244      260      +16     
==========================================
+ Hits          995     1016      +21     
+ Misses         66       65       -1     
+ Partials        1        0       -1     

Flag	Coverage Δ
unittest	93.98% <97.22%> (+0.29%)	⬆️

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