Remove project routing from the user dashboard

### Task Summary

This task is to remove project routing and the related now-dead code:

- Remove the project routing test case in `frontend/src/app/dashboard/component/user/list-item/list-item.component.spec.ts` (lines 145–149) that asserts project entries route to `[USER_PROJECT, "200"]`.
- Remove the corresponding project-routing logic in `list-item.component.ts` (the `initializeEntry` / `entryLink` handling for `type: "project"`).
- Remove the `user/project` and `user/project/:pid` route definitions from `routing.module.ts`, along with any now-unused component references (`UserProjectComponent`, `UserProjectSectionComponent`).
- Clean up any other now-orphaned imports or references to those routes/components.

### Task Type

- [x] Refactor / Cleanup
- [ ] DevOps / Deployment / CI
- [ ] Testing / QA
- [ ] Documentation
- [ ] Performance
- [ ] Other