TenderQueryDto gains validated plz (@MaxLength(5)), region, and
bundesland fields. buildTenderWhere adds three conditional AND-branches:
plz startsWith, bundesland exact-match against the now-backfilled indexed
column (Pitfall 1), and region startsWith (usable independent of the
bundesland column). FilterPanel gets a PLZ input and a 16-Land Bundesland
dropdown (mirrors NUTS1_BUNDESLAND — web/api are separate packages) that
write plz/bundesland into the URL searchParams; ResultsList already
forwards the full URLSearchParams to listTenders(), so no additional
fetch wiring was needed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
schalli
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