DeepSeek Harness music plugin (dsh-plugin)

Key features

• Add a music switch to DeepSeek Harness: Agent can search, play and suspend your songs on the computer.
• The song is in /Music (Mac "music" folder).
• We'll do it when we're on the air, and we'll line up and we won't take this one off.
• You don't have to clean the folder yourself, you don't have to worry about it.
• Turn off the plugs, and the sound will stop.