refactor: Migrate OIDC configuration to system settings

common/constants.go

@@ -43,7 +43,6 @@ var PasswordLoginEnabled = true
 var PasswordRegisterEnabled = true
 var EmailVerificationEnabled = false
 var GitHubOAuthEnabled = false
-var OIDCEnabled = false
 var LinuxDOOAuthEnabled = false
 var WeChatAuthEnabled = false
 var TelegramOAuthEnabled = false
@@ -78,14 +77,6 @@ var SMTPToken = ""
 
 var GitHubClientId = ""
 var GitHubClientSecret = ""
-
-var OIDCClientId = ""
-var OIDCClientSecret = ""
-var OIDCWellKnown = ""
-var OIDCAuthorizationEndpoint = ""
-var OIDCTokenEndpoint = ""
-var OIDCUserInfoEndpoint = ""
-
 var LinuxDOClientId = ""
 var LinuxDOClientSecret = ""