fix: remove remaining Sora references from frontend

The previous Sora removal missed several frontend references, causing
TypeScript build errors for sora_client_enabled and a missing SoraView.vue
import. Clean up all remaining Sora code from types, router, sidebar,
settings, store, and accounts API.

frontend/src/router/index.ts

@@ -201,18 +201,6 @@ const routes: RouteRecordRaw[] = [
       descriptionKey: 'purchase.description'
     }
   },
-  {
-    path: '/sora',
-    name: 'Sora',
-    component: () => import('@/views/user/SoraView.vue'),
-    meta: {
-      requiresAuth: true,
-      requiresAdmin: false,
-      title: 'Sora',
-      titleKey: 'sora.title',
-      descriptionKey: 'sora.description'
-    }
-  },
   {
     path: '/custom/:id',
     name: 'CustomPage',