feat(ui): Credentials + OpenWrtGateway render from cached resources — B4 complete

- Credentials: identity.list + identity.list-credentials become
  useCachedResource entries; explicit reloads still toast on failure.
- OpenWrtGateway: openwrt.get-status caches in the shared store (revisits
  paint the last router state instantly); the connect flow's
  params/No-router-configured semantics are preserved on top of the entry.
- ContainerApps assessed and left as-is: its Pinia store already persists
  across navigation, keeps last data on error, and gates the spinner on
  empty — same class as Apps/Marketplace/Fleet.

This closes the B4 rollout list from docs/FIPS-UPTIME-AND-UI-STATE-PLAN.md.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/__tests__/CredentialsRefresh.test.ts

@@ -1,5 +1,6 @@
 import { flushPromises, mount } from '@vue/test-utils'
 import { describe, expect, it, vi } from 'vitest'
+import { createPinia } from 'pinia'
 import Credentials from '../Credentials.vue'
 import { rpcClient } from '@/api/rpc-client'
 
@@ -42,6 +43,8 @@ describe('Credentials', () => {
 
     const wrapper = mount(Credentials, {
       global: {
+        // The cached-resource layer pulls the Pinia resources store in setup.
+        plugins: [createPinia()],
         mocks: {
           $router: { push: vi.fn() },
         },