feat(router): mount pages-v2 at /v2/* with v2- name prefix

Adds a second routesFolder (src/pages-v2 -> /v2/) and extends
getRouteName so v2 routes get a v2- NAME prefix, preventing collisions
with same-named v1 pages. getPascalCaseRouteName already folds the v2/
URL segment into the base name, so the leading v2- is stripped before
v2RouteName re-adds the canonical prefix (avoids v2-v2-dashboard).
Includes the regenerated typed-router.d.ts and a boot-proof
pages-v2/dashboard.vue placeholder.

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

apps/app/src/pages-v2/dashboard.vue

@@ -0,0 +1,9 @@
+<script setup lang="ts">
+definePage({ meta: { layout: 'OrganizerLayoutV2', public: true } })
+</script>
+
+<template>
+  <div data-testid="v2-dashboard-placeholder">
+    v2 dashboard
+  </div>
+</template>