feat: expand NewListing with AI, soft factors, hard facts, images + MyListings manager

- KI-Hilfe: text description → auto-fills all fields (parseListingText mock parser)
- Lage & Ausstrahlung: 9 soft factor selects (Tief/Mittel/Hoch) mapped to scoring engine
- Technische Details: floor, fit-out, parking, ceiling height
- Bilder: URL list with add/remove
- New /supply/my-listings page: list, status toggle, delete for DIRECT listings
- Added sourceType filter to PropertyFilters + MockupPropertyProvider
- Nav entry "Meine Inserate" added to supply sidebar

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

src/provider/MockupPropertyProvider.ts

@@ -13,6 +13,7 @@ export const MockupPropertyProvider: IPropertyProvider = {
     if (filters?.city) results = results.filter(p => p.location.city.toLowerCase().includes(filters.city!.toLowerCase()))
     if (filters?.minAreaSqm) results = results.filter(p => p.areaSqm >= filters.minAreaSqm!)
     if (filters?.maxRentPerSqm) results = results.filter(p => p.rentPricePerSqm <= filters.maxRentPerSqm!)
+    if (filters?.sourceType) results = results.filter(p => p.sourceType === filters.sourceType)
     if (filters?.organizationId) results = results.filter(p => p.organizationId === filters.organizationId)
     return results
   },