feat: add default container config editor to Environments admin page

New "Default Resource Limits" section in environment detail view with
memory limit/reserve, CPU shares/limit. These defaults apply to new
apps unless overridden per-app.

Added useUpdateDefaultContainerConfig hook for the PUT endpoint.

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

ui/src/api/queries/admin/environments.ts

@@ -54,6 +54,18 @@ export function useUpdateEnvironment() {
   });
 }
 
+export function useUpdateDefaultContainerConfig() {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: ({ id, config }: { id: string; config: Record<string, unknown> }) =>
+      adminFetch<Environment>(`/environments/${id}/default-container-config`, {
+        method: 'PUT',
+        body: JSON.stringify(config),
+      }),
+    onSuccess: () => qc.invalidateQueries({ queryKey: ['admin', 'environments'] }),
+  });
+}
+
 export function useDeleteEnvironment() {
   const qc = useQueryClient();
   return useMutation({