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/components/layout/AppShell.tsx

@@ -89,6 +89,7 @@ const WORKSPACE_CONFIG: Record<WorkspaceType, WorkspaceConfig> = {
       { path: '/supply/anfragen', label: 'Anfragencenter', icon: MessageSquare },
       { path: '/supply/data-quality', label: 'Datenpflege', icon: CheckSquare },
       { path: '/supply/market-intelligence', label: 'Markt Intelligence', icon: Radar },
+      { path: '/supply/my-listings', label: 'Meine Inserate', icon: ClipboardList },
       { path: '/supply/new-listing', label: 'Neues Inserat', icon: Plus },
     ],
   },