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>

.claude/worktrees/agent-a82a3716/src/components/layout/index.ts

@@ -0,0 +1,7 @@
+export { AppShell } from './AppShell'
+export { PageHeader } from './PageHeader'
+export { RightContextPanel } from './RightContextPanel'
+export { CompareTray } from './CompareTray'
+export { UserMenu } from './UserMenu'
+export { NotificationButton } from './NotificationButton'
+export { OrganizationContextBadge } from './OrganizationContextBadge'