killallgit/killallplayer-api

AI Summary: This foundational task involves setting up the initial internal package structure for the Podcast Player API. It requires creating specific directories like `internal/api`, `internal/models`, `internal/services`, `internal/database`, `pkg/config`, `pkg/ffmpeg`, and `pkg/cache`, ensuring they follow Go best practices with clear separation of concerns and include README files. This is a high-priority task that blocks further development.