feat(frontend): 新增廠商缺貨 V2 feature flag

tests/test_frontend_v2_assets.py

@@ -63,3 +63,18 @@ def test_edm_dashboard_v2_is_feature_flagged_and_uses_real_campaign_data():
     assert "scheduler_stats.get(task_key, [])" in template
     assert "mock" not in template.lower()
     assert "假商品" not in template
+
+
+def test_vendor_stockout_v2_is_feature_flagged_and_uses_real_vendor_data():
+    route_source = (ROOT / "routes/vendor_routes.py").read_text(encoding="utf-8")
+    template = (ROOT / "web/templates/vendor_stockout_index_v2.html").read_text(encoding="utf-8")
+
+    assert "request.args.get('ui') == 'v2'" in route_source
+    assert "vendor_stockout_index_v2.html" in route_source
+    assert "_get_vendor_dashboard_stats()" in route_source
+    assert "session.query(VendorStockout).count()" in route_source
+    assert "EmailSendLog" in route_source
+    assert "stats.get('pending_stockouts'" in template
+    assert "stats.get('email_success_rate'" in template
+    assert "mock" not in template.lower()
+    assert "假" not in template