feat: add Codex OAuth login and fix channel config display

- Add OpenAI Codex Device Code Flow login (backend polling + frontend modal)
- Codex provider integrated into preset dropdown (hides URL/API key fields)
- Sync provider model catalogs with Hermes system
- Fix channel config not displaying on first visit (wait for data load)
- Fix sidebar model list not refreshing after adding provider
- Add autocomplete="off" to API key input to prevent browser autofill

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/views/hermes/ChannelsView.vue

@@ -21,7 +21,7 @@ onMounted(() => {
 
     <div class="channels-content">
       <NSpin :show="settingsStore.loading || settingsStore.saving" size="large" :description="t('common.loading')">
-        <PlatformSettings />
+        <PlatformSettings v-if="!settingsStore.loading" />
       </NSpin>
     </div>
   </div>

packages/client/src/views/hermes/ModelsView.vue

@@ -5,9 +5,11 @@ import { useI18n } from 'vue-i18n'
 import ProvidersPanel from '@/components/hermes/models/ProvidersPanel.vue'
 import ProviderFormModal from '@/components/hermes/models/ProviderFormModal.vue'
 import { useModelsStore } from '@/stores/hermes/models'
+import { useAppStore } from '@/stores/hermes/app'
 
 const { t } = useI18n()
 const modelsStore = useModelsStore()
+const appStore = useAppStore()
 const showModal = ref(false)
 
 onMounted(() => {
@@ -24,6 +26,7 @@ function handleModalClose() {
 
 async function handleSaved() {
   await modelsStore.fetchProviders()
+  appStore.loadModels()
   handleModalClose()
 }
 </script>