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/future-signals/FutureSignalEmptyState.tsx

@@ -0,0 +1,28 @@
+import { Box, Typography } from '@mui/material'
+import { Filter, Radio } from 'lucide-react'
+
+type EmptyContext = 'no-signals' | 'filtered-empty'
+
+const META: Record<EmptyContext, { icon: React.ReactNode; title: string; desc: string }> = {
+  'no-signals': {
+    icon: <Radio size={32} color="#94a3b8" />,
+    title: 'Keine Signale vorhanden',
+    desc: 'Es wurden noch keine Zukunftssignale erfasst.',
+  },
+  'filtered-empty': {
+    icon: <Filter size={32} color="#94a3b8" />,
+    title: 'Keine Signale für diese Filter',
+    desc: 'Passen Sie die Filtereinstellungen an, um Signale anzuzeigen.',
+  },
+}
+
+export function FutureSignalEmptyState({ context }: { context: EmptyContext }) {
+  const { icon, title, desc } = META[context]
+  return (
+    <Box sx={{ display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', gap: 1.5, py: 8, px: 3 }}>
+      {icon}
+      <Typography variant="subtitle1" sx={{ fontWeight: 600 }} color="text.secondary">{title}</Typography>
+      <Typography variant="body2" color="text.secondary" sx={{ textAlign: 'center', maxWidth: 280 }}>{desc}</Typography>
+    </Box>
+  )
+}