feat(models): rename ModelPublicUser to ModelPublicUsers and update references

* Update user-related models to use plural naming for consistency
* Add relationships to ModelPublicUsers in related models
* Adjust database migration and schema to reflect changes
* Remove deprecated ModelPublicUser

pkg/storage/db.go

@@ -78,7 +78,7 @@ func CreateTables(ctx context.Context) error {
 
 	// For PostgreSQL, use BUN's auto-generation
 	models := []interface{}{
-		(*models.ModelPublicUser)(nil),
+		(*models.ModelPublicUsers)(nil),
 		(*models.ModelPublicAPIKey)(nil),
 		(*models.ModelPublicHook)(nil),
 		(*models.ModelPublicWhatsappAccount)(nil),