Producer studio: song planner, remix takes, vocal balance, library backup, style packs

[IsaacNewtonne]

Summary

Producer-focused WebUI and server upgrades on top of ea07706. No model or inference defaults changed; the planner compiles direction into the existing YuE2 style prompt.

What is included

• Song planner and voices (singing amount, vocal presence, 1-4 voices, tempo, arrangement, 3-take compare mode) — docs/PRODUCER_CONTROLS.md
• Remix with original seeds and variation control, take-group compare in Library
• Vocal-level adjust (/vocal-balance, auto and manual -6..+6 dB) + setup-vocal-separation.ps1
• Library backup/restore (ZIP), favourites, artwork attach, ComfyUI artwork hooks
• Ollama lyric assistant, style blend favourites, influence ring, studio rail + signal visualizer
• 100+ music style packs (music_styles/) and lyric style packs (lyric_styles/) with thumbnails
• Server: /vocal-balance endpoint, mastering profiles, smoke test (tests/server-smoke.mjs), WebUI tests

Validation

• Node regression tests in tools/webui/tests/, Svelte check clean, Vite + native Release builds, isolated Chrome checks of controls and sequential fresh-seed takes. Browser generation uses mocked audio.

Excluded

Local run logs, agent notes (AUDIT_REPAIRS.md, PROJECT_BUILD_PLAN.md, pinokio_agent/) and docs/lyric-style-pack/ working docs are intentionally not part of this PR.

[ServeurpersoCom]

Thanks for the work! yue2.cpp stays a minimal engine on purpose, so I won't merge an app layer like this one into it: style packs, library, agents and integrations belong in a project built on top of it.

That's exactly what the engine is made for, and I'll happily list your project in the upcoming Third-party projects section, like YuE2 Studio.