Implement a music generation workflow using YuE2 with these steps: 1) Accept lyrics text and style description as input 2) Generate melody-and-chord plan in ABC notation 3) Allow user to manually edit the symbolic score 4) Synthesize to high-quality audio with configurable vocal/instrumental balance 5) Output both the final audio and intermediate representations for debugging. Provide Python code using the staged API (`plan() → generate_semantic() → synthesize() → decode()`).