Delivery Man host-integration smoke tests

Throwaway pages that drive the server-only createDeliveryManClient() against real saved endpoints and WebSockets.

• Weather — a page wired to one endpoint

  A real weather UI built entirely from the saved "Open Meteo" endpoint, with latitude/longitude passed as runtime variables.

• REST — request() (generic)

  Invoke any saved endpoint and inspect the raw response.

• Coinbase — a page wired to one WebSocket

  Live price chart and trade tape for Coinbase Exchange, built from the saved feed with products added live via send().

• WebSocket — watch() / send() (generic)

  Live-stream any saved WebSocket over SSE and send messages back through it.