fix: round website rates to two decimals

backend/test_group_binding_create_sync.py

@@ -129,12 +129,12 @@ def test_create_binding_runs_initial_sync(monkeypatch, db_session):
     )
 
     assert result.target_group_id == "target"
-    assert calls == [("/groups/{id}", "target", "2.2000")]
+    assert calls == [("/groups/{id}", "target", "2.20")]
     log = db_session.query(WebsiteSyncLog).one()
     assert log.status == "success"
     assert log.message == "同步成功"
-    assert log.old_rate == "1"
-    assert log.new_rate == "2.2"
+    assert log.old_rate == "1.00"
+    assert log.new_rate == "2.20"
 
 
 def test_create_binding_skips_write_when_website_auto_sync_disabled(db_session):
@@ -152,7 +152,7 @@ def test_create_binding_skips_write_when_website_auto_sync_disabled(db_session):
     assert log.status == "success"
     assert log.message == "网站未启用自动同步，未写回"
     assert log.old_rate is None
-    assert log.new_rate == "2.2"
+    assert log.new_rate == "2.20"
 
 
 def test_create_binding_skips_write_when_binding_disabled(db_session):
@@ -168,7 +168,7 @@ def test_create_binding_skips_write_when_binding_disabled(db_session):
     log = db_session.query(WebsiteSyncLog).one()
     assert log.status == "success"
     assert log.message == "绑定未启用，未写回"
-    assert log.new_rate == "2.2"
+    assert log.new_rate == "2.20"
 
 
 def test_create_binding_keeps_binding_when_initial_sync_calculation_fails(db_session):
@@ -241,11 +241,11 @@ def test_update_binding_runs_sync_after_save(monkeypatch, db_session):
     )
 
     assert result.target_group_id == "target"
-    assert calls == [("/groups/{id}", "target", "2.4000")]
+    assert calls == [("/groups/{id}", "target", "2.40")]
     log = db_session.query(WebsiteSyncLog).one()
     assert log.status == "success"
     assert log.message == "同步成功"
-    assert log.new_rate == "2.4"
+    assert log.new_rate == "2.40"
 
 
 def test_update_binding_skips_write_when_disabled(monkeypatch, db_session):
@@ -339,8 +339,8 @@ def test_create_binding_notifies_when_website_rate_changes(monkeypatch, db_sessi
     _, payload = sent_payloads[0]
     assert payload["event"] == "website_rate_changed"
     assert payload["website"]["id"] == website.id
-    assert payload["target_group"]["old_rate"] == "1"
-    assert payload["target_group"]["new_rate"] == "2.2"
+    assert payload["target_group"]["old_rate"] == "1.00"
+    assert payload["target_group"]["new_rate"] == "2.20"
     log = db_session.query(NotificationLog).one()
     assert log.event_type == "website_rate_changed"
     assert log.status == "success"