fix(hf): integrate Static INT8 ONNX build into Dockerfile and fix thread state guard in app.py

fix: add gc.collect() in train.py to prevent memory leak during long CPU runs

Fix training crash on CPU, reduce val_freq, add OpenCV env vars

fix: resolve basicSR training loop termination bug when changing dataset size

feat: add custom stage 3 training runner and fix Windows/CPU resume path compatibility in BasicSR

feat: clone CodeFormer, download pretrained weights, and verify imports