feat(layouts): add OrganizerLayoutV2 + AppShellV2 skeleton

Tailwind-grid shell skeleton with named slot regions (sidebar, topbar,
default, drawer). OrganizerLayoutV2 wires the skeleton with RouterView,
selectable via definePage meta. Vitest component mount test: 2 tests pass.

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

apps/app/src/layouts/OrganizerLayoutV2.vue

@@ -0,0 +1,26 @@
+<script setup lang="ts">
+// OrganizerLayoutV2 — v2 layout file selected by
+// definePage({ meta: { layout: 'OrganizerLayoutV2' } }) on pages-v2/**
+// (RFC-WS-GUI-REDESIGN AD-G2). Plan 1: wires the skeleton + RouterView.
+// A later plan fills the sidebar/topbar/drawer slots with ported
+// PrimeVue shell pieces.
+import AppShellV2 from '@/layouts/components/AppShellV2.vue'
+</script>
+
+<template>
+  <AppShellV2>
+    <template #sidebar>
+      <nav class="w-72 border-r border-surface-200 p-4 dark:border-surface-800">
+        <span class="text-sm text-surface-500">Crewli v2</span>
+      </nav>
+    </template>
+
+    <template #topbar>
+      <header class="flex h-14 items-center border-b border-surface-200 px-6 dark:border-surface-800">
+        <span class="text-sm text-surface-500">v2 shell (skeleton)</span>
+      </header>
+    </template>
+
+    <RouterView />
+  </AppShellV2>
+</template>