Add custom user-LoRA (Quality mode) for the MPS route

feat(ui): add ZeroGPU 2x-quota caution banner (Spaces only); drop dev banner from README

feat(zerogpu): get all modes working on ZeroGPU

fix(ui): replace track_tqdm with a manual step callback for clear progress labels

feat(mps): run locally on Apple Silicon MPS with a pre-inference OOM preflight

chore(ui): add active-development "do not run inference" banner (app + README)

fix(zerogpu): set duration to 180 and lower Quality default steps to 28

fix(zerogpu): cap queue concurrency and raise @spaces.GPU duration (Fast 120 / Quality 180)

fix: pass local gate and harden ZeroGPU path

feat: build Qwen Image Editor app (Edit/Compose tabs, Fast/Quality, ZeroGPU + local CUDA) with tests