feat: Aktivitätslog tab in PropertyDetailView — per-property timeline

Adds a new "Aktivitätslog" tab (9th tab) to the supply-side property
drawer. Shows match approvals/rejections, need registrations, data
quality flags, and governance actions linked to this specific property.
Only visible to Verwaltung users in their own property view.

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

src/hooks/useActivityLog.ts

@@ -0,0 +1,12 @@
+import { useQuery } from '@tanstack/react-query'
+import { governanceService } from '../services/governanceService'
+
+export function usePropertyActivityLog(propertyId: string) {
+  return useQuery({
+    queryKey: ['activityLog', 'property', propertyId],
+    queryFn: () => governanceService.getActivityLogByProperty(propertyId),
+    staleTime: 30_000,
+    select: (res) => res.data ?? [],
+    enabled: !!propertyId,
+  })
+}