fix(matching): exclude external scraped listings from demand results

External third-party scrapes (Homegate/ImmoScout/newhome/MatchOffice) were mis-tagged as VERIFIED_PORTFOLIO in mock data and surfaced as "own platform" matches. Skip them in match generation — demand results now only contain genuine platform objects, Maison Work, and Future Availability.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/services/matchSyncService.ts

@@ -87,12 +87,23 @@ function scoreProperty(
   return calculateScore(need, prop)
 }
 
+// Externe Inserate aus Drittquellen (Scrapes) sind keine Plattform-Inventar-Objekte und
+// gehören nicht in die Treffer (nur eigene Plattform-Objekte, Maison Work, Future Availability).
+const EXTERNAL_SCRAPE_SOURCES = new Set(['HOMEGATE_SCRAPE', 'IMMOSCOUT_SCRAPE', 'NEWHOME_SCRAPE', 'MATCHOFFICE_SCRAPE'])
+
+function isExternalListing(prop: Property): boolean {
+  return prop.resultType === ResultType.VERIFIED_PORTFOLIO
+    && !!prop.sourceType && EXTERNAL_SCRAPE_SOURCES.has(prop.sourceType)
+}
+
 /** Generate matches for a single need against all properties and push them into matchStore. */
 export function generateMatchesForNeed(need: Need): void {
   const now = new Date().toISOString()
   const MIN_SCORE = 22
 
   for (const prop of propertyStore) {
+    // Externe Scrape-Inserate, die fälschlich als Plattform-Objekt getaggt sind → nicht matchen
+    if (isExternalListing(prop)) continue
     const hasExplicitUnits = (prop.units ?? []).length > 0
 
     if (hasExplicitUnits) {