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/OrganizationSwitcher.tsx

@@ -0,0 +1,40 @@
+import { FormControl, MenuItem, Select, Typography } from '@mui/material'
+import type { SelectChangeEvent } from '@mui/material'
+import { authService } from '../../services/authService'
+import { useSessionStore } from '../../stores/sessionStore'
+
+const MOCK_ORGANIZATIONS = [
+  { id: 'org-wincasa', name: 'Wincasa AG' },
+  { id: 'org-mobimo', name: 'Mobimo Management AG' },
+  { id: 'org-ubs', name: 'UBS Asset Management RE' },
+]
+
+export function OrganizationSwitcher() {
+  const { activeOrganizationId } = useSessionStore()
+
+  async function handleChange(e: SelectChangeEvent<string>) {
+    await authService.switchOrganization(e.target.value)
+  }
+
+  return (
+    <FormControl size="small" fullWidth sx={{ mt: 0.5 }}>
+      <Typography
+        variant="caption"
+        sx={{ color: 'text.secondary', fontWeight: 600, textTransform: 'uppercase', letterSpacing: 0.5, mb: 0.5, display: 'block' }}
+      >
+        Organisation
+      </Typography>
+      <Select
+        value={activeOrganizationId ?? ''}
+        onChange={handleChange}
+        sx={{ fontSize: '0.8rem' }}
+      >
+        {MOCK_ORGANIZATIONS.map((org) => (
+          <MenuItem key={org.id} value={org.id} sx={{ fontSize: '0.8rem' }}>
+            {org.name}
+          </MenuItem>
+        ))}
+      </Select>
+    </FormControl>
+  )
+}