Updated backend to use single 'name' field instead of 'first_name' and 'last_name'
to match the actual database schema where users table has a 'name' column.
Changes:
- Updated User and UserPublic interfaces to use 'name' and 'avatar_url'
- Updated user validators to use 'name' instead of first/last names
- Updated all SQL queries in user.service.ts to select u.name
- Updated search filters and sort columns
- Fixed user creation and update operations
This resolves the "column u.first_name does not exist" error.
Esteban
c910ce8996