feat: Users API, ownership transfer and removal of the legacy role string

internal/infrastructure/persistence/models/userModel.go

@@ -12,7 +12,6 @@ type User struct {
 	Email                   string  `gorm:"unique;not null;size:255"`
 	DisplayName             string  `gorm:"not null;default:'';size:255"`
 	IsVerified              bool    `gorm:"default=false;not null"`
-	Role                    string  `gorm:"not null;default:'';size:32"`
 	RoleID                  *uint32 `gorm:"index"`
 	VerificationCode        *string `gorm:"unique;size:255"`
 	VerificationExpiration  time.Time