feat: remove Administration workspace — keep only Verwaltung + Suche

- Delete all ops page components (ReviewQueue, AIMonitoring, Governance,
  SourceMonitoring, ActivityTimeline, SignalPipeline)
- Remove OPERATIONS workspace from AppShell config, nav order, path detection
- Remove all /ops/* routes from App.tsx
- Remove WorkspaceType.OPERATIONS from allowedWorkspaces in authService,
  sessionStore, permissions
- Keep MarketIntelligence page (already moved to /supply/market-intelligence)

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

src/components/assistant/GlobalAIAssistantDrawer.tsx

@@ -16,7 +16,6 @@ import type { WorkspaceType } from '../../domain/enums'
 function resolveWorkspace(pathname: string): WorkspaceType | null {
   if (pathname.startsWith('/supply')) return 'SUPPLY' as WorkspaceType
   if (pathname.startsWith('/demand')) return 'DEMAND' as WorkspaceType
-  if (pathname.startsWith('/ops'))    return 'OPERATIONS' as WorkspaceType
   return null
 }