test(lint): cover the PortalLayoutV2 branch of require-v2-layout-meta

Adds a valid case (PortalLayoutV2 under pages-v2/portal) and an invalid
case (OrganizerLayoutV2 under pages-v2/portal -> wrongLayout) so the
rule's portal-path branch has positive + negative coverage. Closes the
Task 5 code-review Important finding.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/app/eslint-rules/__tests__/require-v2-layout-meta.spec.ts

@@ -27,8 +27,19 @@ ruleTester.run('require-v2-layout-meta', rule, {
       filename: 'src/pages/dashboard.vue',
       code: '<script setup lang="ts">const x = 1</script><template><div/></template>',
     },
+    {
+      // pages-v2/portal/** expects PortalLayoutV2, not OrganizerLayoutV2
+      filename: 'src/pages-v2/portal/artists.vue',
+      code: '<script setup lang="ts">definePage({ meta: { layout: \'PortalLayoutV2\' } })</script><template><div/></template>',
+    },
   ],
   invalid: [
+    {
+      // OrganizerLayoutV2 is wrong under the portal subtree
+      filename: 'src/pages-v2/portal/artists.vue',
+      code: '<script setup lang="ts">definePage({ meta: { layout: \'OrganizerLayoutV2\' } })</script><template><div/></template>',
+      errors: [{ messageId: 'wrongLayout' }],
+    },
     {
       filename: 'src/pages-v2/dashboard.vue',
       code: '<script setup lang="ts">const x = 1</script><template><div/></template>',