fix(authorization-service): 修复 identity-service 响应解析

- 处理 TransformInterceptor 包装的响应格式 { success, data }
- 正确提取 data 字段中的用户信息

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/authorization-service/src/infrastructure/external/identity-service.client.ts

@@ -54,13 +54,15 @@ export class IdentityServiceClient implements OnModuleInit {
     try {
       this.logger.debug(`[HTTP] POST /internal/users/batch - ${accountSequences.length} users`);
 
-      const response = await this.httpClient.post<UserInfo[]>(
+      const response = await this.httpClient.post<{ success: boolean; data: UserInfo[] }>(
         `/api/v1/internal/users/batch`,
         { accountSequences },
       );
 
-      if (response.data && Array.isArray(response.data)) {
-        for (const user of response.data) {
+      // identity-service 使用 TransformInterceptor 包装响应为 { success, data }
+      const users = response.data?.data || response.data;
+      if (users && Array.isArray(users)) {
+        for (const user of users) {
           result.set(user.accountSequence, user);
         }
       }