feat(catalog): preserve and display dataset value scores

backend/tests/catalog_fake.py

@@ -37,6 +37,7 @@ def catalog_response(request, fields=None):
                 "category": {"name": "基本面"},
                 "subcategory": {"name": "财务报表"},
                 "fieldCount": 123,
+                "valueScore": 2.0,
                 "description": "合成数据，仅用于验收",
             },
             {
@@ -45,6 +46,7 @@ def catalog_response(request, fields=None):
                 "category": {"name": "新闻"},
                 "subcategory": {"name": "情绪"},
                 "fieldCount": 3,
+                "valueScore": 0.0,
             },
             {"id": "TEST_UNKNOWN", "name": "TEST 未分类", "fieldCount": 0},
         ]

backend/tests/test_catalog.py

@@ -279,3 +279,17 @@ async def test_dynamic_platform_scopes_and_validation(catalog):
     runner.client.disconnect()
     assert (await client.get(BASE + "/scopes")).status_code == 409
     assert (await search(client))["total"] == 0
+
+
+async def test_dataset_value_score_survives_sync_and_sorts_null_last(catalog):
+    client, _, _ = catalog
+    assert (await sync(catalog))["status"] == "completed"
+    rows = (await search(client, sort="value_score", direction="desc"))["items"]
+    assert [(row["id"], row["value_score"]) for row in rows] == [
+        ("TEST_FIN", 2.0), ("TEST_NEWS", 0.0), ("TEST_UNKNOWN", None)
+    ]
+    rows = (await search(client, sort="value_score", direction="asc"))["items"]
+    assert [row["value_score"] for row in rows] == [0.0, 2.0, None]
+    assert (await search(client, "/datasets/TEST_FIN"))["value_score"] == 2.0
+    assert (await search(client, "/datasets/TEST_NEWS"))["value_score"] == 0.0
+    assert (await search(client, "/datasets/TEST_UNKNOWN"))["value_score"] is None