GET /api/tools/courts[?courtType=UPC-LD] returns the deadline-
computation slice of paliad.courts (id, code, names, country, regime,
court_type) — distinct from the rich Gerichtsverzeichnis at
/api/courts. Optional courtType filter narrows to a single tier.
POST /api/tools/fristenrechner and POST /api/tools/fristenrechner/
calculate-rule both accept an optional courtId field. When set, the
calculator resolves the court's (country, regime) and uses that
calendar; when omitted, the proceeding's existing jurisdiction column
seeds a sensible default — preserves today's behaviour for callers
that don't yet send a court.
Frontend: court-picker-row added to step 2 of the Fristenrechner
wizard. Visible only for proceeding types with multiple compatible
courts (today: every UPC-flavoured proceeding — UPC LDs span 12
countries, plus UPC CD seats and the CoA). DE-only proceedings (BPatG
nullity, BGH appeals, DPMA, EPA, EP grant) keep the form unchanged.
Picker re-runs the calc on selection so the user sees the same
deadlines shift to a different calendar without a manual click. i18n
key deadlines.court.label added for both DE and EN.
Default courts wired sensibly: UPC_INF / UPC_REV / UPC_PI etc. → UPC
LD München (HLC's home venue); UPC_APP / UPC_APP_ORDERS /
UPC_COST_APPEAL → UPC CoA Luxembourg; UPC_REV → UPC CD Paris.
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