feat: UC-A/B/C demo — 50 mock properties, district scoring, gold/silver cards visible

- Add 50 mock properties (prop-050–099) tuned for UC-A (Fahrradhändler RETAIL),
  UC-B (Umzugsfirma OFFICE Zürich-West) and UC-C (Vermögensverwalter PREMIUM)
- District-aware scoreLocation: district match→100, city-only→70 when need
  specifies districts, canton→60, no match→35; fixes UC-C prop-001 over-scoring
- mustHaveScorer: add klimatisierung keyword; parking minimum count logic
- Soft factor scale fix: integer 0–100 values no longer multiplied ×100
- footfall: map passerbyFrequency string (HIGH→85, MEDIUM_HIGH→68…) before
  enrichment fallback so RETAIL properties score correctly
- Parser: Kreis list extraction ("Kreis 3, 4, 5, und 8" → 4 district entries),
  neighbourhood→district map (Seefeld, Bahnhofstrasse), prestige signals
- Results: remove VERIFIED_PORTFOLIO role gate — all users see portfolio cards,
  enabling gold (85+) and silver (70–84) cards for every demo use case
- Fix flash of wrong cards on NeedBuilder nav (effectiveNeedId not activeNeed?.id)
- needs.ts: UC-A preferredLocations now includes Kreis 3/4/5/8 entries

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

src/domain/needBuilder.ts

@@ -8,6 +8,14 @@ export interface ParsedNeedCriteria {
   timing?: { earliestMoveIn: string; latestMoveIn?: string; contractDurationMonths?: number; flexibleTiming: boolean }
   mustHaveCriteria?: string[]
   softFactors?: { minPrestige?: number; requireParking?: boolean; maxPublicTransportMinutes?: number; requireHighVisibility?: boolean }
+  requireGroundFloor?: boolean
+  requiredFitOut?: 'BASIC' | 'FULL' | 'PREMIUM'
+  requiredParkingMin?: number
+  requireAirConditioning?: boolean
+  requireLoadingDock?: boolean
+  requireBarrierFree?: boolean
+  minCeilingHeightM?: number
+  minContractDurationMonths?: number
   infrastructureRequirements?: string[]
   accessibilityRequirements?: string[]
   prestigeImportance?: 'LOW' | 'MEDIUM' | 'HIGH'