feat(api): add web wx-qr create and status endpoints.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_wx_qr_api.py

@@ -0,0 +1,33 @@
+"""web wx-qr create/status API。"""
+from unittest.mock import patch
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.main import app
+from app.services import wx_qr_session
+
+client = TestClient(app)
+
+
+@pytest.fixture(autouse=True)
+def force_memory_backend(monkeypatch):
+    monkeypatch.setattr(wx_qr_session, "_redis", lambda: None)
+    wx_qr_session._memory_clear_for_tests()
+
+
+def test_wx_qr_create_and_poll_pending():
+    with patch(
+        "app.api.public.get_unlimited_wxacode",
+        return_value=b"\x89PNG\r\n\x1a\n",
+    ):
+        r = client.post("/api/web/auth/wx-qr/create")
+        assert r.status_code == 200
+        body = r.json()
+        assert body.get("code") == 200
+        data = body["data"]
+        sid = data["sessionId"]
+        assert data["qrImageBase64"].startswith("data:image/")
+        st = client.get("/api/web/auth/wx-qr/status", params={"sessionId": sid})
+    assert st.status_code == 200
+    assert st.json()["data"]["status"] == "pending"