Devfront back-channel logout 설정 UI 및 i18n 추가

devfront/src/lib/devApi.ts

@@ -12,6 +12,8 @@ export type ClientSummary = {
   clientSecret?: string;
   tokenEndpointAuthMethod?: string;
   jwksUri?: string;
+  backchannelLogoutUri?: string;
+  backchannelLogoutSessionRequired?: boolean;
   redirectUris: string[];
   scopes: string[];
   metadata?: Record<string, unknown>;
@@ -118,6 +120,8 @@ export type ClientUpsertRequest = {
   responseTypes?: string[];
   tokenEndpointAuthMethod?: string;
   jwksUri?: string;
+  backchannelLogoutUri?: string;
+  backchannelLogoutSessionRequired?: boolean;
   metadata?: Record<string, unknown>;
 };