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

plans/feature/homepage-navigation-carousel-feature.md

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+# Homepage Navigation and Carousel Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Make homepage CTAs navigate in the current page, automate homepage carousels, preserve the hero visual as a capped image, add product-center gutters, and temporarily hide two navigation menus.
+
+**Architecture:** Keep behavior local to the existing Vue components. Use native current-page navigation for CTAs, lifecycle-managed timers for the step carousel, a duplicated CSS marquee for customer cases, and responsive CSS custom properties for product-center gutters.
+
+**Tech Stack:** Nuxt 4, Vue 3 Composition API, Tailwind CSS, Vitest, Vue Test Utils
+
+---
+
+### Task 1: Lock navigation behavior
+- [x] Add failing tests for current-page CTA and product-card navigation.
+- [x] Replace new-tab links and inert CTA buttons with immediate current-page navigation.
+- [x] Hide recommendation and solution navigation entries while retaining implementation code.
+
+### Task 2: Automate homepage rotating content
+- [x] Add failing timer tests for the four-step carousel.
+- [x] Add a lifecycle-managed automatic step interval.
+- [x] Animate the duplicated customer-case track continuously and add reduced-motion behavior.
+
+### Task 3: Improve desktop layout
+- [x] Keep `/主视觉.png` as an `<img>` with intrinsic aspect ratio and a capped rendered size.
+- [x] Add responsive left and right gutters to the product center.
+
+### Task 4: Verify and document
+- [x] Update homepage, product-center, structure, and Agent reference docs.
+- [x] Run website tests and production build.
+- [x] Skip browser automation per the user's request; cover navigation, timing, hero image, country alignment, and bottom action behavior with Vitest.