feat: add orphaned app cleanup — auto-filter stale discovered apps, manual dismiss with data purge

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/api/queries/catalog.ts

@@ -1,4 +1,4 @@
-import { useQuery } from '@tanstack/react-query';
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { config } from '../../config';
 import { useAuthStore } from '../../auth/auth-store';
 import { useRefreshInterval } from './use-refresh-interval';
@@ -61,6 +61,27 @@ export function useCatalog(environment?: string) {
   });
 }
 
+export function useDismissApp() {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: async (applicationId: string) => {
+      const token = useAuthStore.getState().accessToken;
+      const res = await fetch(`${config.apiBaseUrl}/catalog/${applicationId}`, {
+        method: 'DELETE',
+        headers: {
+          Authorization: `Bearer ${token}`,
+          'X-Cameleer-Protocol-Version': '1',
+        },
+      });
+      if (res.status === 409) throw new Error('Cannot dismiss — live agents are still connected');
+      if (!res.ok) throw new Error(`Failed to dismiss: ${res.status}`);
+    },
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['catalog'] });
+    },
+  });
+}
+
 export function useRouteMetrics(from?: string, to?: string, appId?: string, environment?: string) {
   const refetchInterval = useRefreshInterval(30_000);
   return useQuery({