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/auth/index.ts

@@ -0,0 +1,7 @@
+export { AccessDenied } from './AccessDenied'
+export { SessionExpired } from './SessionExpired'
+export { PermissionGate } from './PermissionGate'
+export { RoleGuard } from './RoleGuard'
+export { ProtectedRoute } from './ProtectedRoute'
+export { DemoRoleSwitcher } from './DemoRoleSwitcher'
+export { OrganizationSwitcher } from './OrganizationSwitcher'