⬆ Bump @tanstack/router-vite-plugin from 1.19.0 to 1.121.4 in /frontend

Bumps [@tanstack/router-vite-plugin](https://github.com/TanStack/router/tree/HEAD/packages/router-vite-plugin) from 1.19.0 to 1.121.4.
- [Release notes](https://github.com/TanStack/router/releases)
- [Commits](https://github.com/TanStack/router/commits/v1.121.4/packages/router-vite-plugin)

---
updated-dependencies:
- dependency-name: "@tanstack/router-vite-plugin"
  dependency-version: 1.121.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]