feat(product-center): implement Figma-designed UI, upload module, and website tests

- Redesign website homepage & product-center per Figma (fonts, logos, hero/footer/customer cases)
- Add API upload module (multer) with static serving for uploads/public assets
- Add OriginGood.delisted flag and SDS request retry logic
- Add admin ImageUpload component and goods import/upload flows
- Add vitest suite for website components and composables (32 tests)
- Add skills, docs, plans and PRODUCT.md

apps/website/app/components/WhyInkReach.vue

@@ -1,5 +1,5 @@
 <template>
-  <section class="py-10 lg:py-16 px-4 lg:px-6 bg-inkreach-homepage-2">
+  <section class="why-section py-10 lg:py-16 px-4 lg:px-6 bg-inkreach-homepage-2">
     <div class="max-w-7xl mx-auto">
       <h2 class="text-2xl md:text-4xl lg:text-5xl font-bold text-center mb-8 lg:mb-10">
         为什么选择<span
@@ -30,3 +30,7 @@ const reasons = [
   { title: '全球配送', icon: '/全球配送图标.png' },
 ];
 </script>
+
+<style scoped>
+@media (min-width: 1024px) { .why-section { height: 430px; } }
+</style>