发布候选：整合桌面端界面与发布稳定化里程碑

backend/tests/test_registration.py

@@ -70,6 +70,22 @@ async def add_email_settings(SessionLocal, domain: str) -> None:
         await session.commit()
 
 
+@pytest.mark.asyncio
+async def test_email_domains_come_only_from_email_service_settings(client_and_db):
+    client, SessionLocal = client_and_db
+
+    empty_response = await client.get("/api/v1/auth/email-domains")
+    assert empty_response.status_code == 200
+    assert empty_response.json() == {"items": []}
+    assert empty_response.headers["cache-control"] == "no-store"
+
+    await add_email_settings(SessionLocal, "example.com")
+    configured_response = await client.get("/api/v1/auth/email-domains")
+    assert configured_response.status_code == 200
+    assert configured_response.json() == {"items": ["example.com"]}
+    assert configured_response.headers["cache-control"] == "no-store"
+
+
 async def encrypted_auth_payload(client: AsyncClient, email: str, password: str) -> dict:
     key_resp = await client.get("/api/v1/auth/login-key")
     assert key_resp.status_code == 200