eKRS API changed: financial reports are now under
dzial3.wzmiankiOZlozonychDokumentach.wzmiankaOZlozeniuRocznegoSprawozdaniaFinansowego
(not dzial3.sprawozdaniaFinansowe). Date format changed from
YYYY-MM-DD to DD.MM.YYYY and period from separate fields to
combined "OD DD.MM.YYYY DO DD.MM.YYYY" string.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
