feat: add Maison Work source type, rename ExternalMarket to Direktinserat, hide own portfolio from demand search by default

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

src/hooks/useUnifiedResults.ts

@@ -50,12 +50,12 @@ export function useUnifiedResults(needId?: string) {
         const property = properties.find(p => p.id === (match.resultId ?? match.propertyId))
         if (!property) return []
 
-        if (rt === 'EXTERNAL_MARKET') {
+        if (rt === 'EXTERNAL_MARKET' || rt === 'MAISON_WORK') {
           const result: ExternalMarketResult = {
             matchId: match.id,
             needId: match.needId,
             matchScore: match.matchScore,
-            resultType: 'EXTERNAL_MARKET',
+            resultType: rt as 'EXTERNAL_MARKET' | 'MAISON_WORK',
             property,
             match,
           }