feat: soft factor enrichment from Swiss location intelligence

When property has no soft factor data, estimate from location:
- 18 location rules covering CH cities/districts (Zürich quartiers,
  Zug tax haven, Bern, Basel, Genf, Lausanne, Luzern, Winterthur,
  logistics hubs) + generic CH fallback
- Estimated factors marked with 'estimated: true' on ScoreFactor
- ScoreBreakdownPanel shows purple 'Schätzung' badge on estimated rows
- Scoring engine: neutral 50 only if no location match found

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

src/domain/match.ts

@@ -33,6 +33,7 @@ export interface ScoreFactor {
   score: number         // 0–100
   contribution: number  // weighted points added to total
   explanation: string
+  estimated?: boolean   // true when score was derived from location intelligence, not direct data
 }
 
 // ── Explainability Types ──────────────────────────────────────────────────────