weather-gov/weather.gov ? reverse-engineered prompt

Build me a working copy of the weather.gov 2.0 site that runs locally with the same kind of setup this repo describes. I want a forecast website with the main pages loading in the browser, plus the supporting API proxy and the backend that serves forecast content. Make it easy to start with one command, and have it open on localhost so I can see the site and check the proxy status.

Please keep the app clean, polished, and close to a real public weather site, with the pieces wired together so the frontend can talk to the backend and API layer. Add or update tests so the important flows still work, especially the live site behavior. If anything depends on current docs or modern tooling details, look them up online if you need to.