fix: 修正 websites router 中错误的 website.accounts_endpoint 属性调用为默认值，并增加对已存在账号名称回显与默认端点引用的单元测试

backend/app/routers/websites.py

@@ -668,7 +668,7 @@ def import_upstream_keys_as_accounts(
         has_list_accounts = hasattr(c, "list_accounts")
         if has_list_accounts:
             try:
-                remote_accounts_list = c.list_accounts(endpoint=website.accounts_endpoint)
+                remote_accounts_list = c.list_accounts()
                 if remote_accounts_list is not None:
                     for acc in remote_accounts_list:
                         aid = c.extract_id(acc)

backend/test_priority_algorithm_correction.py

@@ -231,3 +231,66 @@ def test_naming_format_on_manual_import(db_session, monkeypatch):
     # 优先使用 group_name，若为空使用 group_id
     assert acc1["name"] == f"{u.name}-G1-Name-{k1.id}"
     assert acc2["name"] == f"{u.name}-G2-{k2.id}"
+
+
+def test_import_already_exists_displays_remote_name_and_uses_default_endpoint(db_session, monkeypatch):
+    """验证当导入已存在账号时，FakeClient 实现了 list_accounts，断言其使用默认的 /accounts，并返回 exists 状态且 account_name 为远端已有名称。"""
+    w = Website(name="W1", base_url="http://w1", enabled=True, site_type="sub2api", auth_config_json="{}", timeout_seconds=30)
+    u = Upstream(name="U1", base_url="http://u1")
+    db_session.add_all([w, u])
+    db_session.commit()
+    db_session.refresh(w); db_session.refresh(u)
+
+    k1 = UpstreamGeneratedKey(
+        upstream_id=u.id,
+        group_id="G1",
+        group_name="G1-Name",
+        key_name="K1",
+        key_value="V1",
+        imported_website_id=w.id,
+        imported_account_id="existing-remote-id",
+        status="imported"
+    )
+    db_session.add(k1)
+    db_session.commit()
+
+    list_accounts_called_with = []
+
+    class FakeClient:
+        def __init__(self, *args, **kwargs): pass
+        def __enter__(self): return self
+        def __exit__(self, *args): pass
+        def get_groups(self, *args, **kwargs):
+            return []
+        def list_accounts(self, endpoint="/accounts"):
+            list_accounts_called_with.append(endpoint)
+            return [
+                {
+                    "id": "existing-remote-id",
+                    "name": "My-Existing-Remote-Name",
+                }
+            ]
+        def extract_id(self, data):
+            return data.get("id")
+
+    monkeypatch.setattr("app.routers.websites._client", lambda website: FakeClient())
+    monkeypatch.setattr("app.services.website_client.Sub2ApiWebsiteClient", FakeClient)
+
+    req = ImportAccountsRequest(
+        upstream_key_ids=[k1.id],
+        target_group_map={},
+        auto_priority_by_rate=False,
+        priority=10,
+        account_name_prefix="some-prefix",
+        default_platform="openai",
+    )
+
+    response = import_upstream_keys_as_accounts(w.id, req, db_session)
+
+    # 验证 list_accounts 调用使用了默认的 /accounts 端点
+    assert list_accounts_called_with == ["/accounts"]
+
+    # 验证返回 exists 状态，且 account_name 使用了远端已有的名字 "My-Existing-Remote-Name"
+    assert len(response.items) == 1
+    assert response.items[0].status == "exists"
+    assert response.items[0].account_name == "My-Existing-Remote-Name"