Changed python location and transformer version

Dockerfile

@@ -9,14 +9,14 @@ ENV HF_HUB_ENABLE_HF_TRANSFER=1 \
     GIT_LFS_SKIP_SMUDGE=1 \
     PIP_DISABLE_PIP_VERSION_CHECK=1
 
-# Install exact Transformers version dots.ocr expects (qwen2_vl APIs),
+# Install compatible Transformers version for vLLM 0.9.1 (>=4.51.1 required)
 # plus minimal utils. vLLM image already includes CUDA/PyTorch.
-RUN pip install --no-cache-dir "transformers==4.48.3" "huggingface_hub>=0.24.0"
+RUN pip install --no-cache-dir "transformers>=4.51.1" "huggingface_hub>=0.24.0"
 
 # Pre-download the model repo into /weights/DotsOCR
 # Note: dots.ocr requires the directory name to avoid '.' (see model card).
 ARG MODEL_ID=rednote-hilab/dots.ocr
-RUN python - <<'PY'
+RUN python3 - <<'PY'
 from huggingface_hub import snapshot_download
 import os, shutil
 root = "/weights"