fix: download LFS files from HF API during Docker build

HF Docker builds copy LFS pointers, not real files. Added a build
step that detects pointer files and downloads the actual binaries
from the HF Hub resolve API.

Dockerfile

@@ -11,11 +11,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libglib2.0-0 libsm6 libxrender1 libxext6 libxcb1 libgl1 libgomp1 \
     ffmpeg libavcodec-dev libavformat-dev libavutil-dev libswscale-dev \
     libavdevice-dev libopus-dev libvpx-dev libsrtp2-dev \
-    build-essential nodejs npm git git-lfs \
+    build-essential nodejs npm curl \
     && rm -rf /var/lib/apt/lists/*
 
-RUN git lfs install
-
 RUN pip install --no-cache-dir torch torchvision --index-url https://download.pytorch.org/whl/cpu
 
 COPY requirements.txt ./
@@ -23,31 +21,43 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . .
 
-# If HF copies LFS pointers instead of real files, pull them
-RUN if head -c 40 checkpoints/mlp_best.pt 2>/dev/null | grep -q 'git-lfs'; then \
-      echo "LFS pointers detected — pulling real files..." && \
-      git lfs pull 2>/dev/null || echo "git lfs pull skipped (no .git dir)"; \
-    fi
-
+# HF Docker builds copy LFS pointers, not real files.
+# Resolve them by downloading from the HF API.
+ARG HF_SPACE=FocusGuard/final
 RUN python -c "\
-import os, sys;\
-checks = [\
-  ('checkpoints/mlp_best.pt', 1000),\
-  ('checkpoints/scaler_mlp.joblib', 100),\
-  ('checkpoints/xgboost_face_orientation_best.json', 1000),\
-  ('checkpoints/hybrid_focus_config.json', 50),\
+import os, urllib.request, sys;\
+SPACE='${HF_SPACE}';\
+BASE=f'https://huggingface.co/spaces/{SPACE}/resolve/main';\
+files=[\
+  'checkpoints/mlp_best.pt',\
+  'checkpoints/scaler_mlp.joblib',\
+  'checkpoints/hybrid_combiner.joblib',\
+  'checkpoints/hybrid_focus_config.json',\
+  'checkpoints/xgboost_face_orientation_best.json',\
+  'checkpoints/meta_best.npz',\
+  'checkpoints/meta_mlp.npz',\
+  'checkpoints/L2CSNet_gaze360.pkl',\
+  'models/L2CS-Net/models/L2CSNet_gaze360.pkl',\
 ];\
-ok = True;\
-for path, min_bytes in checks:\
-  if not os.path.isfile(path):\
-    print(f'[MISSING] {path}'); ok = False\
-  elif os.path.getsize(path) < min_bytes:\
-    print(f'[BAD] {path} only {os.path.getsize(path)}B — likely LFS pointer'); ok = False\
+for f in files:\
+  path=f;\
+  is_ptr=False;\
+  if os.path.isfile(path):\
+    with open(path,'rb') as fh:\
+      is_ptr=fh.read(50).startswith(b'version https://git-lfs');\
+  if not os.path.isfile(path) or is_ptr:\
+    url=f'{BASE}/{f}';\
+    print(f'Downloading {f} ...');\
+    try:\
+      os.makedirs(os.path.dirname(path),exist_ok=True);\
+      urllib.request.urlretrieve(url,path);\
+      sz=os.path.getsize(path);\
+      print(f'  OK ({sz} bytes)');\
+    except Exception as e:\
+      print(f'  WARN: {e}');\
   else:\
-    print(f'[OK] {path} ({os.path.getsize(path)} bytes)');\
-if not ok:\
-  print('Checkpoint verification failed — models will not load'); sys.exit(1);\
-print('All checkpoints verified')\
+    print(f'[OK] {f} ({os.path.getsize(path)} bytes)');\
+print('Checkpoint resolution done')\
 "
 
 RUN npm install && npm run build && mkdir -p /app/static && cp -R dist/* /app/static/