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/PermissionGate.tsx

@@ -0,0 +1,19 @@
+import type { ReactNode } from 'react'
+import type { MockUser } from '../../stores/sessionStore'
+import { useSessionStore } from '../../stores/sessionStore'
+
+interface PermissionGateProps {
+  check: (user: MockUser) => boolean
+  fallback?: ReactNode
+  children: ReactNode
+}
+
+export function PermissionGate({ check, fallback = null, children }: PermissionGateProps) {
+  const { currentUser } = useSessionStore()
+
+  if (!currentUser || !check(currentUser)) {
+    return <>{fallback}</>
+  }
+
+  return <>{children}</>
+}