docs(specs): add radio-browser station lookup spec (DRAFT)HEADmain

A spec for searching radio-browser.info from Emacs and turning a selection into a playable radio .m3u, reusing the existing writer, multi-directory sourcing, and mpv path. The player can already read and play radio playlists but has no native way to discover stations, so every station is hand-entered from a browser.

I verified the API live (server discovery and station search) and matched the output to the existing radio .m3u format. All four design decisions are resolved: built-in url.el, multi-select writing one file per station, saving into the MPD playlist directory, and create-and-play. The spec has two build phases and is ready for spec-review.

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