refactor(vendor): 抽出缺貨 API 查詢服務

tests/test_frontend_v2_assets.py

@@ -255,6 +255,23 @@ def test_vendor_stockout_list_v2_is_production_default_and_uses_real_stockout_ro
     assert "假" not in template
 
 
+def test_vendor_stockout_api_queries_are_extracted_to_service():
+    route_source = (ROOT / "routes/vendor_routes.py").read_text(encoding="utf-8")
+    service_source = (ROOT / "services/vendor_stockout_query_service.py").read_text(encoding="utf-8")
+
+    api_section = route_source.split("def api_get_stockout_list():", 1)[1].split("@vendor_bp.route('/api/stockout/<int:stockout_id>'", 1)[0]
+
+    assert "get_stockout_api_list_payload(" in api_section
+    assert "get_stockout_batches_payload(vendor_db)" in api_section
+    assert "session.query(VendorStockout)" not in api_section
+    assert "def get_stockout_api_list_payload(" in service_source
+    assert "def get_stockout_batches_payload(vendor_db)" in service_source
+    assert "'batch_number': record.batch_id" in service_source
+    assert "'send_status': record.status or 'pending'" in service_source
+    assert "'latest_date': batch.latest_date.isoformat()" in service_source
+    assert "from flask" not in service_source
+
+
 def test_vendor_stockout_import_v2_is_feature_flagged_and_does_not_ship_sample_rows():
     route_source = (ROOT / "routes/vendor_routes.py").read_text(encoding="utf-8")
     template = (ROOT / "templates/vendor_stockout_import_v2.html").read_text(encoding="utf-8")