feat: unit-level matching architecture — match against Einheiten, not Objekte

- domain/property: add getEffectiveUnits() — returns explicit units or synthesises
  one from property-level data so all properties work uniformly at unit level
- domain/match: add unitId? field — every Match references a specific unit
- domain/unifiedResult: add unit? to VerifiedPortfolioResult + ExternalMarketResult
- MockupNeedProvider: generateSyntheticMatches iterates getEffectiveUnits(prop);
  computeScore uses unit-level areaSqm + rentPricePerSqm; resultId for PRE-MARKET
  signals matches useSchattenmarktSignals signal ID format
- useUnifiedResults: resolve unit from match.unitId for VERIFIED_PORTFOLIO/EXTERNAL_MARKET
- matchCardAdapter: unit now extracted for all result types; unitId from match.unitId
- IntelligenceMatchCard: regular cards show unit chip (floor + label + m²) when a
  named unit is known — only adds context, never shows for synthetic/whole-property units

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/domain/property.ts

@@ -2,6 +2,7 @@ import type {
   AssetType, ResultType, AvailabilityStatus, AvailabilityType,
   FreshnessStatus, RiskLevel, SourceType, DataQualityLevel,
 } from './enums'
+import { AvailabilityStatus as AS } from './enums'
 
 // ── Location / Address ────────────────────────────────────────────────────────
 
@@ -196,3 +197,27 @@ export interface Property {
 
 export type CreatePropertyInput = Omit<Property, 'id' | 'createdAt' | 'updatedAt'>
 export type UpdatePropertyInput = Partial<CreatePropertyInput>
+
+/**
+ * Returns the rentable units of a property.
+ * For properties without explicit units, synthesises one unit from property-level data
+ * so that all matching logic can operate uniformly at unit level.
+ */
+export function getEffectiveUnits(p: Property): PropertyUnit[] {
+  if (p.units && p.units.length > 0) return p.units
+  return [{
+    id: p.id,
+    propertyId: p.id,
+    floorLevel: p.hardFacts?.floor ?? p.floorLevel ?? 0,
+    unitLabel: undefined,
+    areaSqm: p.areaSqm,
+    available: p.availabilityStatus === AS.AVAILABLE_NOW || p.availabilityStatus === AS.AVAILABLE_SOON,
+    rentPricePerSqm: p.rentPricePerSqm,
+    currentTenant: p.currentTenant,
+    leaseTerm: p.leaseTerm,
+    leaseEndDate: p.leaseEndDate,
+    schattenmarktRelease: p.schattenmarktRelease?.enabled
+      ? { enabled: true, availableFrom: p.leaseEndDate }
+      : undefined,
+  }]
+}