1629339569
Applies the stashed 'deps and cpu mode' work: cuda was hardcoded on the candle dependency lines, making the candle-cuda feature flag dead and any non-CUDA build impossible. Now default = [candle-cuda] for the main dev machine, with pnpm dev:app:cpu / build:app:cpu (--no-default-features) for CPU-only machines and CI. Also trims unused deps (log, uuid, tokio-full, chrono-serde). Verified: cargo check --locked --no-default-features passes.