fix: use slug field for model lookup instead of name concat

Change GET /sexy/models/:slug endpoint to query u.slug directly
instead of concatenating LOWER(first_name || ' ' || last_name).
This matches the actual slug field in the directus_users table.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/bundle/src/endpoint/index.ts

@@ -119,7 +119,7 @@ export default {
 					.from("directus_users as u")
 					.leftJoin("directus_roles as r", "u.role", "r.id")
 					.where("r.name", "Model")
-					.where(database.raw("LOWER(u.first_name || ' ' || u.last_name)"), slug.toLowerCase().replace(/-/g, " "))
+					.where("u.slug", slug)
 					.first();
 
 				if (!model) {