fix(client): list each route once on the Pages tab - #1181

router.getRoutes() already returns nested routes as their own records with full paths, but the Pages tab also walked each record's children, which keep the relative paths from the route config. With /users/:id and children profile and posts, the tab says "6 routes registered" while Overview counts 4, it lists extra profile and posts rows, and on /users/1/profile three rows are marked active. The extra rows also navigate to the wrong place: from /users/1, clicking posts pushes a relative path that resolves to /users/posts and matches /users/:id with id: 'posts'.

This drops the recursion in pages.vue and renders the snapshot routes as they are, still sorted by path. The kit snapshot is left as is, so children is still there for the agent router tool.

Ran:

• pnpm vitest run tests/integration/client/pages-routes.test.ts: fails on main (6 rows, 3 active), passes with the change
• pnpm test: 71 files, 433 tests passed
• pnpm typecheck, plus vp lint and vp fmt --check on the changed files: clean
• pnpm --filter @vue/devtools-client build: ok

Checked: the test fixture matches what createRouterSnapshot returns for a real vue-router 5.4.0 router with the same routes.