feat: merge Markt-Leads + Markt Intelligence → Marktchancen

Two-pane UX (from Market Intelligence) with supply-relevant data
(FutureSignal + portfolio property matches from Markt-Leads):
- Left pane: filterable signal list with probability badge + portfolio match count
- Right pane: company overview, KI-Analyse, market indicators, Faktencheck,
  portfolio matches (click → Meine Objekte), Reminder erstellen action
- No OPS-level actions (approve/reject/review stripped out)
- Nav: remove Markt-Leads entry, rename to Marktchancen

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

src/App.tsx

@@ -26,7 +26,7 @@ const Anfragencenter = lazy(() => import('./pages/supply/Anfragencenter'))
 const FutureAvailability = lazy(() => import('./pages/supply/FutureAvailability'))
 const DataQuality = lazy(() => import('./pages/supply/DataQuality'))
 const ReminderManager = lazy(() => import('./pages/supply/ReminderManager'))
-const MarketLeads = lazy(() => import('./pages/supply/MarketLeads'))
+const MarketIntelligence = lazy(() => import('./pages/supply/MarketIntelligence'))
 const NewListing = lazy(() => import('./pages/supply/NewListing'))
 const MyListings = lazy(() => import('./pages/supply/MyListings'))
 
@@ -38,7 +38,6 @@ const Anfragen = lazy(() => import('./pages/demand/Anfragen'))
 const Pipeline = lazy(() => import('./pages/demand/Pipeline'))
 const PropertyDetail = lazy(() => import('./pages/demand/PropertyDetail'))
 
-const MarketIntelligence = lazy(() => import('./pages/ops/MarketIntelligence'))
 
 function App() {
   return (
@@ -62,7 +61,6 @@ function App() {
                 <Route path="/supply/future-availability" element={<FutureAvailability />} />
                 <Route path="/supply/data-quality" element={<DataQuality />} />
                 <Route path="/supply/reminder-manager" element={<ReminderManager />} />
-                <Route path="/supply/market-leads" element={<MarketLeads />} />
                 <Route path="/supply/market-intelligence" element={<MarketIntelligence />} />
                 <Route path="/supply/new-listing" element={<NewListing />} />
                 <Route path="/supply/my-listings" element={<MyListings />} />