feat: harden phase one workflows

miniapp/miniprogram/api/productApi.test.js

@@ -0,0 +1,12 @@
+const { buildProductQuery } = require('./productApi')
+
+describe('buildProductQuery', () => {
+  test('keeps pagination and optional filters stable', () => {
+    expect(buildProductQuery(2, '苹果')).toEqual({
+      pageNo: 1,
+      pageSize: 20,
+      categoryId: 2,
+      keyword: '苹果'
+    })
+  })
+})