Add Order Colocation card and JSON API card to the UI
Adds an Order Colo card (shown only when KOLO_ORDER_URL is set, so Hop179-only via deployment config; examples/hop179.env points it at https://my.hop179.net/order/main/packages/colo-qupra) and a JSON API card in the style of aspa.hop179.net.
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KOLO_ORDER_URL: optional, validated at startup (absolute http/https only) - Order card sits under the calculator; API card under it
- API card: curl examples using the page origin, collapsible parameters table
- Tests: config validation, card order, escaping, unsafe schemes, card absent when unset
Not verified in a real browser (no headless browser here) — worth a quick visual check in light and dark mode.