test(contract): groups/available 契约夹具补 web_search_price_per_call 字段

backend/internal/server/api_contract_test.go

@@ -366,6 +366,7 @@ func TestAPIContracts(t *testing.T) {
 						"video_price_480p": null,
 						"video_price_720p": null,
 						"video_price_1080p": null,
+						"web_search_price_per_call": null,
 						"allow_image_generation": false,
 						"allow_batch_image_generation": false,
 						"batch_image_discount_multiplier": 0,