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

internal/infrastructure/persistence/models/inviteModel.go

@@ -7,7 +7,8 @@ type Invite struct {
 	Email      string `gorm:"index;not null;size:255"`
 	HashedCode string `gorm:"not null"`
 	ExpiresAt  time.Time
-	InvitedBy  uint32 `gorm:"not null"`
+	InvitedBy  uint32  `gorm:"not null"`
+	RoleID     *uint32 `gorm:"index"`
 	AcceptedAt *time.Time
 	CreatedAt  time.Time `gorm:"autoCreateTime"`
 }