feat: support "Use Email as username" in org (#3002)

Signed-off-by: Grégoire Bélorgey <gregoire@jianda.fr>

object/init.go

@@ -108,6 +108,7 @@ func initBuiltInOrganization() bool {
 		AccountItems:       getBuiltInAccountItems(),
 		EnableSoftDeletion: false,
 		IsProfilePublic:    false,
+		UseEmailAsUsername: false,
 	}
 	_, err = AddOrganization(organization)
 	if err != nil {

object/organization.go

@@ -72,6 +72,7 @@ type Organization struct {
 	InitScore              int        `json:"initScore"`
 	EnableSoftDeletion     bool       `json:"enableSoftDeletion"`
 	IsProfilePublic        bool       `json:"isProfilePublic"`
+	UseEmailAsUsername     bool       `json:"useEmailAsUsername"`
 
 	MfaItems     []*MfaItem     `xorm:"varchar(300)" json:"mfaItems"`
 	AccountItems []*AccountItem `xorm:"varchar(5000)" json:"accountItems"`