feat(domain): F004 – expand domain model layer

- need.ts: add SizeRange, MustHaveCriterion, WeightedPreference types; extend Need with desiredLocation, sizeRange, mustHaveCriteria, weightedPreferences, status
- futureSignal.ts: add SignalEvidence type; extend FutureSignal with title, evidence, matchabilityScore, reviewStatus
- aiOutput.ts: new AIOutput entity with type, inputHash, outputJson, provider/model/promptVersion/schemaVersion, reviewStatus
- activityEvent.ts: new ActivityEvent entity with actorId, action, entityType, entityId, timestamp, metadata
- unifiedResult.ts: discriminated union (VerifiedPortfolioResult | ExternalMarketResult | FutureAvailabilityResult)
- index.ts: export all three new files
- Properties.tsx: add LIGHT_INDUSTRIAL + UNKNOWN cases to exhaustive switches

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

src/pages/supply/Properties.tsx

@@ -30,6 +30,8 @@ function getAssetTypeLabel(type: AssetType): string {
     case AssetType.GASTRO: return 'Gastro'
     case AssetType.PRODUCTION: return 'Produktion'
     case AssetType.MIXED: return 'Gemischt'
+    case AssetType.LIGHT_INDUSTRIAL: return 'Leichtindustrie'
+    case AssetType.UNKNOWN: return 'Unbekannt'
   }
 }
 
@@ -41,6 +43,8 @@ function getAssetTypeColor(type: AssetType): string {
     case AssetType.GASTRO: return '#0d9488'
     case AssetType.PRODUCTION: return '#92400e'
     case AssetType.MIXED: return '#6b7280'
+    case AssetType.LIGHT_INDUSTRIAL: return '#b45309'
+    case AssetType.UNKNOWN: return '#9ca3af'
   }
 }