fix: ShopFiber24 sitemap-based scraping + Fibermall image extraction
ShopFiber24 (fiber24.ts):
- Complete rewrite: was using JS-rendered catalog (all prices = 0)
- New strategy: fetch sitemap_0.xml.gz → 310 product DE-URLs
- Each product page has Schema.org microdata: itemprop=price, sku, image
- Extracts: price (minPrice), SKU, image_url, name, specs
- Rate: 1 req/1.5s, no Playwright needed
FiberMall (fibermall.ts):
- Add imageUrl to Product interface
- Extract first fibermall.com/photo/*.jpg from product listing card
- Write image_url to transceivers table (has_image=true) on upsert
- SKU variants share parent product image
- 304 FiberMall transceivers will get images on next scraper run
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