Remove platform tenancy from SXCHNGE customer BFF (#34)

backend/pkg/db/account/account.go

@@ -5,12 +5,10 @@ import (
 
 	"git.sendico.io/tech/sxchnge/bff/pkg/db/template"
 	"git.sendico.io/tech/sxchnge/bff/pkg/model"
-	"go.mongodb.org/mongo-driver/v2/bson"
 )
 
 // DB is the interface which must be implemented by all db drivers
 type DB interface {
 	template.DB[*model.Account]
 	GetByEmail(ctx context.Context, email string) (*model.Account, error)
-	GetAccountsByRefs(ctx context.Context, orgRef bson.ObjectID, refs []bson.ObjectID) ([]model.Account, error)
 }