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/upload/upload.controller.ts

@@ -0,0 +1,42 @@
+import {
+  Controller,
+  Post,
+  UseInterceptors,
+  UploadedFile,
+  BadRequestException,
+} from '@nestjs/common';
+import { FileInterceptor } from '@nestjs/platform-express';
+import { diskStorage } from 'multer';
+import { extname, join } from 'path';
+import { randomUUID } from 'crypto';
+
+const UPLOAD_DIR = join(process.cwd(), 'uploads');
+
+@Controller('upload')
+export class UploadController {
+  @Post('image')
+  @UseInterceptors(
+    FileInterceptor('file', {
+      storage: diskStorage({
+        destination: UPLOAD_DIR,
+        filename: (_req, file, cb) => {
+          const ext = extname(file.originalname) || '.png';
+          cb(null, `${randomUUID()}${ext}`);
+        },
+      }),
+      limits: { fileSize: 5 * 1024 * 1024 },
+      fileFilter: (_req, file, cb) => {
+        if (!file.mimetype.startsWith('image/')) {
+          return cb(new BadRequestException('仅支持图片文件'), false);
+        }
+        cb(null, true);
+      },
+    }),
+  )
+  uploadImage(@UploadedFile() file: Express.Multer.File) {
+    if (!file) {
+      throw new BadRequestException('请选择要上传的文件');
+    }
+    return { url: `/uploads/${file.filename}`, filename: file.filename };
+  }
+}