feat: harden phase one workflows

miniapp/miniprogram/api/secondGoodsApi.test.js

@@ -0,0 +1,12 @@
+const { buildSecondGoodsQuery } = require('./secondGoodsApi')
+
+describe('buildSecondGoodsQuery', () => {
+  test('keeps pagination and optional filters stable', () => {
+    expect(buildSecondGoodsQuery('母婴', '儿童')).toEqual({
+      pageNo: 1,
+      pageSize: 20,
+      category: '母婴',
+      keyword: '儿童'
+    })
+  })
+})