Fixed a bug where projects created by a user that are also in a resource pool
the user has access to would appear twice in the GET /projects response.
Changes:
- Add seen_project_ids set to track already added projects
- Check for duplicates before adding projects in Step 2 (user projects)
- Check for duplicates before adding projects in Step 3 (resource pool projects)
This ensures each project appears only once regardless of whether it's user-created
or shared via resource pool.
1eca8c5c94