fix: close platform-check silent-success loophole — raise WebsiteError on None list, missing account, or stale platform after update

backend/app/routers/websites.py

@@ -48,7 +48,7 @@ from app.schemas.website import (
     SyncUpstreamModelsResponse,
 )
 
-from app.services.website_client import Sub2ApiWebsiteClient, _extract_id
+from app.services.website_client import Sub2ApiWebsiteClient, WebsiteError, _extract_id
 from app.services.website_sync import (
     binding_sources,
     sync_binding,
@@ -1826,15 +1826,19 @@ def organize_website_groups(
                                         remote_acc["group_ids"] = new_group_ids
                                     if "platform" in update_payload:
                                         # 主动核对防线：防止子站忽略 platform 修改而发生静默失败
-                                        fresh_accs = c.list_accounts() or []
+                                        fresh_accs = c.list_accounts()
+                                        if fresh_accs is None:
+                                            raise WebsiteError("复查失败：拉取远端账号列表返回空，无法核对平台修改是否生效")
                                         fresh_acc = next((a for a in fresh_accs if str(c.extract_id(a)) == str(old_account_id)), None)
-                                        if fresh_acc:
-                                            remote_account_map[str(old_account_id)] = fresh_acc
-                                            new_platform = fresh_acc.get("platform")
-                                            if str(new_platform).lower() != str(platform).lower():
-                                                raise WebsiteError(
-                                                    f"远端账号不支持修改平台属性，尝试将平台从 {remote_platform} 修改为 {platform} 失败"
-                                                )
+                                        if not fresh_acc:
+                                            raise WebsiteError(f"复查失败：在远端账号列表中未找到要更新的账号 {old_account_id}")
+
+                                        remote_account_map[str(old_account_id)] = fresh_acc
+                                        new_platform = fresh_acc.get("platform")
+                                        if str(new_platform).lower() != str(platform).lower():
+                                            raise WebsiteError(
+                                                f"远端账号不支持修改平台属性，尝试将平台从 {remote_platform} 修改为 {platform} 失败"
+                                            )
                                         remote_acc["platform"] = platform
 
                                     msg_parts = []