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/api/src/origin-goods/origin-goods.service.ts

@@ -29,6 +29,7 @@ export interface OriginGoodsTreeNode {
   goodImage: string | null;
   goodPrice: string | null;
   sdsGoodId: string;
+  delisted: boolean;
   configuredCount: number;
   configuredCountries: string[];
   configuredTags: { tagName: string; tagColor: string | null; tagFontColor: string | null; tagGroupId: string | null; tagGroupName: string | null; sortOrder: number }[];
@@ -110,7 +111,7 @@ export class OriginGoodsService {
             parentCategoryId: true,
           },
         }),
-        this.prisma.originGood.findMany({ orderBy: { goodName: 'asc' } }),
+        this.prisma.originGood.findMany({ where: { delisted: false }, orderBy: { goodName: 'asc' } }),
         this.prisma.good.groupBy({
           by: ['originGoodId'],
           _count: { _all: true },
@@ -194,7 +195,9 @@ export class OriginGoodsService {
       const childrenCats = allCategories.filter(
         (c) => c.parentCategoryId !== null && c.parentCategoryId === cat.id,
       );
-      const childNodes = childrenCats.map(buildNode);
+      const childNodes = childrenCats
+        .map(buildNode)
+        .filter((n) => n.totalCount > 0);
 
       const ogsForThisCat = allOriginGoods.filter(
         (og) => ogToCategory.get(og.id.toString()) === cat.id.toString(),
@@ -205,6 +208,7 @@ export class OriginGoodsService {
         goodImage: og.goodImage,
         goodPrice: og.goodPrice?.toString() ?? null,
         sdsGoodId: og.sdsGoodId,
+        delisted: og.delisted,
         configuredCount: countMap.get(og.id.toString()) ?? 0,
         configuredCountries: countryMap.get(og.id.toString()) ?? [],
         configuredTags: tagMap.get(og.id.toString()) ?? [],
@@ -229,7 +233,7 @@ export class OriginGoodsService {
     };
 
     const roots = allCategories.filter((c) => c.parentCategoryId === null);
-    const tree = roots.map(buildNode);
+    const tree = roots.map(buildNode).filter((n) => n.totalCount > 0);
 
     const unmapped = allOriginGoods.filter(
       (og) => !ogToCategory.has(og.id.toString()),
@@ -250,6 +254,7 @@ export class OriginGoodsService {
           goodImage: og.goodImage,
           goodPrice: og.goodPrice?.toString() ?? null,
           sdsGoodId: og.sdsGoodId,
+          delisted: og.delisted,
           configuredCount: countMap.get(og.id.toString()) ?? 0,
           configuredCountries: countryMap.get(og.id.toString()) ?? [],
           configuredTags: tagMap.get(og.id.toString()) ?? [],