StylinArts Image Pipeline

Use:
/img?src=<ENCODED_SOURCE_URL>&w=800

src accepted forms:
- https://cdn.shopify.com/...
- //cdn.shopify.com/...          (protocol-relative)
- https://www.stylinarts.com/cdn/shop/...
- /cdn/shop/...                 (path on www)

Optional:
&h=800&q=80&fit=cover&dpr=2&format=auto

Rules:
- w required (max 3000)
- Safe fallback to original src if transform fails.