🍒 weather/noaa: Add a local copy of the station list as a fallback

The index of noaa stations is now unavailable online.

Yet another piece of tape on the breaking tank, but let's hope it is enough for 6.1, since the full porting to the new API means a harder refactor.

Also fix the observation url path, to avoid needing several redirections.

(cherry picked from commit 29db371c)