perf: slim daw_engine bundle 409MB->170MB + fix engine khong chay tren Windows
- Thay librosa bang app/core/audio_features.py (numpy/scipy/soundfile):
load, beat_track, frames_to_time, spectral_centroid, rms, zero_crossing_rate,
time_stretch, pitch_shift, chroma_stft. A/B ngang librosa (BPM <1% sai lech,
pitch_shift chuan toi Hz). Loai bo llvmlite 171MB + scikit-learn + numba.
- Task layer 2 che do (app/tasks/worker.py): server giu celery; desktop slim
chay in-process thread + registry, giu nguyen API contract (.delay/.id/status
/tasks/{id}) nen frontend khong doi.
- engine.spec: excludes librosa/numba/llvmlite/sklearn/celery/redis/kombu/
billiard/amqp/msgpack/yaml/PIL/cairosvg/zstandard/...; scan scipy gioi han
scipy.signal; giu click (uvicorn.main import click).
- render_engine: scipy.signal thanh lazy import (giam cold start).
- tauri.conf.json: targets [nsis, msi] - NSIS tro lai (bundle nho) de
hooks.nsh cai VC++ Redistributable - sua bug daw_engine.exe khong chay
tren Windows (truoc day MSI-only khong chay hooks).
- build_linux.sh / build_macos.sh: build 1 lenh moi OS.
- Doc: DESKTOP_INSTALL_PLAN.md muc 5.1.
- Verify: 86 tests pass, engine dong goi upload/analyze/waveform/export OK.
3dtours
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