fix(oauth): align custom binding response fields in frontend (#6818)

* fix(oauth): align custom binding response fields in frontend

* fix(oauth): restore custom access policy guidance

web/src/features/users/api.ts

@@ -18,6 +18,7 @@ For commercial licensing, please contact support@quantumnous.com
 */
 import type { PermissionCatalog } from '@/lib/admin-permissions'
 import { api } from '@/lib/api'
+import type { CustomOAuthBinding } from '@/lib/oauth'
 
 import type {
   User,
@@ -178,19 +179,12 @@ export async function getPermissionCatalog(): Promise<PermissionCatalog> {
 // Admin Binding Management APIs
 // ============================================================================
 
-export interface OAuthBinding {
-  provider_id: string
-  provider_name: string
-  user_id?: number
-  external_id?: string
-}
-
 /**
  * Get user's custom OAuth bindings (admin)
  */
 export async function getUserOAuthBindings(
   userId: number
-): Promise<ApiResponse<OAuthBinding[]>> {
+): Promise<ApiResponse<CustomOAuthBinding[]>> {
   const res = await api.get(`/api/user/${userId}/oauth/bindings`)
   return res.data
 }
@@ -211,7 +205,7 @@ export async function adminClearUserBinding(
  */
 export async function adminUnbindCustomOAuth(
   userId: number,
-  providerId: string
+  providerId: number
 ): Promise<ApiResponse> {
   const res = await api.delete(
     `/api/user/${userId}/oauth/bindings/${providerId}`