fix: IsDiscordIdAlreadyTaken 应该检查软删除记录

model/user.go

@@ -588,7 +588,7 @@ func IsGitHubIdAlreadyTaken(githubId string) bool {
 }
 
 func IsDiscordIdAlreadyTaken(discordId string) bool {
-	return DB.Where("discord_id = ?", discordId).Find(&User{}).RowsAffected == 1
+	return DB.Unscoped().Where("discord_id = ?", discordId).Find(&User{}).RowsAffected == 1
 }
 
 func IsOidcIdAlreadyTaken(oidcId string) bool {