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/assistant/GlobalAIAssistantButton.tsx

@@ -0,0 +1,35 @@
+import { Box, IconButton, Tooltip } from '@mui/material'
+import { Sparkles } from 'lucide-react'
+import { useAssistantStore } from '../../stores/assistantStore'
+
+export function GlobalAIAssistantButton() {
+  const { isOpen, open } = useAssistantStore()
+
+  return (
+    <Tooltip title="AI Assistent öffnen" placement="left">
+      <Box
+        sx={{
+          position: 'fixed',
+          bottom: 24,
+          right: 24,
+          zIndex: 1250,
+          display: isOpen ? 'none' : 'flex',
+        }}
+      >
+        <IconButton
+          onClick={open}
+          sx={{
+            width: 48,
+            height: 48,
+            bgcolor: '#4f46e5',
+            color: 'white',
+            boxShadow: '0 4px 16px rgba(79,70,229,0.4)',
+            '&:hover': { bgcolor: '#4338ca' },
+          }}
+        >
+          <Sparkles size={20} />
+        </IconButton>
+      </Box>
+    </Tooltip>
+  )
+}