Free official gold price widget

New /widgets/gold-price configurator and auto-refreshing /embed/xau iframe: live spot-derived gold in 31 currencies, per troy ounce or gram, eight karats, light/dark/auto themes, and seven languages. No signup or API key. The branded iframe is free for personal and commercial websites with its Powered by goldprice.dev link intact; dealer premiums and taxes are explicitly excluded.