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

skills/inkreach-official-website/SKILL.md

@@ -0,0 +1,31 @@
+---
+name: inkreach-official-website
+description: Work with the InkReach Nuxt website homepage and API-backed product center.
+---
+
+# InkReach Website
+
+## Homepage
+
+- Route: `/`
+- Page: `apps/website/app/pages/index.vue`
+- Sections: `apps/website/app/components/`
+- Reference: `docs/references/homepage.md`
+
+Keep homepage sections componentized. The desktop Figma baseline is 1440px wide; preserve the documented section boundaries while allowing existing mobile styles to remain responsive.
+
+Homepage CTAs navigate in the current page to `https://inkpod.vip/user/login`. Keep the step process and feature showcase rotating every two seconds; customer cases continuously scroll at the same per-item cadence with reduced-motion support. Keep `/主视觉.png` as a capped `800 x 400` image rather than a CSS background. Recommendation and solution navigation are intentionally hidden until their content is ready.
+
+## Product Center
+
+- Route: `/product-center`
+- Page: `apps/website/app/pages/product-center.vue`
+- Query state: `apps/website/app/composables/useProductCenter.ts`
+- UI components: `apps/website/app/components/product/`
+- Reference: `docs/references/product-center.md`
+
+Default to all products and countries with no logistics or craft selection. Never hard-code backend IDs. Keep props down and typed events up. Verify changes with the website Vitest suite, Nuxt production build, and browser screenshots.
+
+Countries, categories, tags, tag groups, and icons are backend-owned. Preserve relative backend asset paths in the database and resolve them through `runtimeConfig.public.backendUrl` in `useProductCenter.ts`. Do not add country-name flag fallbacks or infer tag groups from numeric sort positions. Versioned Figma icon assets live under `apps/api/public/product-center/`; run `pnpm --filter @inkreach/api configure:product-center-icons` to apply them to matching existing records.
+
+The public goods API exposes `originGood.sdsGoodId` as the product `id`. Use that value for InkPOD detail links; never build an InkPOD URL from the local `goods.good_id` primary key.