HassMediaSearchAndPlay no mapping for MASSMediaType.RADIO

### The problem After #173602 there is no longer a mapping between `MediaClass` and `MASSMediaType` for `MASSMediaType.RADIO`. This results in searches for radio stations playing anything but the radio station (e.g. search for HR-Info starts playing recordings by HR-Symphony Orchestra). In conjunction with this voice assistant is missing a radio option for media_class that should probably be added after this is fixed. I'm not sure if I should open another issue against https://github.com/OHF-Voice/ for that. ### What version of Home Assistant Core has the issue? core-2026.8.1 ### What was the last working version of Home Assistant Core? _No response_ ### What type of installation are you running? Home Assistant Container ### Integration causing the issue Music Assistant ### Link to integration documentation on our website https://www.home-assistant.io/integrations/music_assistant ### Diagnostics information _No response_ ### Example YAML snippet ```yaml ``` ### Anything in the logs that might be useful for us? ```txt ``` ### Additional information _No response_