feat(supply): per-unit fit-out/cost-bearer/MAB/parking with object fallback (resolveUnitFacts)

- unit: add fitOutByLandlord, mieterausbaubeitragPerSqm, parkingSpots (parking = allocation from object pool)
- lib/unitFacts.resolveUnitFacts: single resolver (unit value ?? object value) used by scorer + card adapter
- matchSyncService: pre-market unit scored via resolved facts (fit-out, MAB, cost-bearer, parking allocation)
- matchCardAdapter: fit-out label/viability/investment via resolveUnitFacts
- UnitStructurePanel: consolidate ALL per-unit overrides into the one expandable row editor (price, availability, Ausbaustandard, Wer-baut-aus, MAB, parking allocation); show parking on row
- PreMarketUnitGrid/Panel: drop the duplicate per-unit fit-out select (now in the unit editor)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/unitFacts.ts

@@ -0,0 +1,25 @@
+import type { Property, PropertyUnit } from '../domain/property'
+
+export interface ResolvedUnitFacts {
+  fitOut?: 'SHELL' | 'BASIC' | 'FULL' | 'PREMIUM'
+  mabPerSqm: number
+  fitOutByLandlord?: boolean
+  parkingSpots?: number
+  rentPricePerSqm: number
+}
+
+/**
+ * Effektive Ausbau-/Preis-/Parkplatz-Werte für eine Einheit: Einheit-Wert ?? Objekt-Wert.
+ * Parkplätze: Einheit-Zuteilung; bei Einzel-Einheit-Objekten der ganze Objekt-Pool als Fallback.
+ */
+export function resolveUnitFacts(property: Property, unit?: PropertyUnit | null): ResolvedUnitFacts {
+  const hf = property.hardFacts
+  const singleUnit = (property.units?.length ?? 0) <= 1
+  return {
+    fitOut: unit?.fitOut ?? hf?.fitOut,
+    mabPerSqm: unit?.mieterausbaubeitragPerSqm ?? hf?.mieterausbaubeitragPerSqm ?? 0,
+    fitOutByLandlord: unit?.fitOutByLandlord ?? hf?.fitOutByLandlord,
+    parkingSpots: unit?.parkingSpots ?? (singleUnit ? hf?.parking : undefined),
+    rentPricePerSqm: unit?.rentPricePerSqm ?? property.rentPricePerSqm,
+  }
+}