feat: add profile management page with full CRUD UI

- Add frontend API layer, Pinia store, and 5 components (ProfileCard, ProfilesPanel, ProfileCreateModal, ProfileRenameModal, ProfileImportModal)
- Add ProfilesView page with card grid layout and expandable details
- Modify export endpoint to stream file as browser download instead of returning server path
- Add sidebar nav entry, router route, and i18n translations (en/zh)
- Support create, rename, delete, switch (with gateway restart), export, and import profiles

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

packages/client/src/router/index.ts

@@ -25,6 +25,11 @@ const router = createRouter({
       name: 'hermes.models',
       component: () => import('@/views/hermes/ModelsView.vue'),
     },
+    {
+      path: '/hermes/profiles',
+      name: 'hermes.profiles',
+      component: () => import('@/views/hermes/ProfilesView.vue'),
+    },
     {
       path: '/hermes/logs',
       name: 'hermes.logs',