fix(docker): resolve GroundingDINO build and NumPy runtime errors

Dockerfile

@@ -118,13 +118,21 @@ RUN git clone https://github.com/luca-medeiros/lang-segment-anything /tmp/lang-s
     git checkout 9bdf77715fa70fca96452184abdc64a6666e0d46 && \
     pip install --no-deps -e .
 
-# Optional sanity checks
+# Install Gradio and accelerate
+RUN python3 -m pip install --no-cache-dir gradio==6.13.0 accelerate==1.0.1
+
+# Optional: avoids hot-reload warning on Spaces
+RUN pip install --no-cache-dir spaces
+
+# Critical fix: keep NumPy on 1.x for torch/torchvision compatibility
+RUN pip install --no-cache-dir --force-reinstall "numpy<2"
+
+# Sanity checks
+RUN python -c "import numpy; print('numpy version:', numpy.__version__)"
+RUN python -c "import torch; import numpy; print('torch ok / numpy ok')"
 RUN python -c "import groundingdino; print('groundingdino ok')"
 RUN python -c "import lang_sam; print('lang_sam ok')"
 
-# Upgrade pip and install Gradio
-RUN python3 -m pip install --no-cache-dir gradio==6.13.0 accelerate==1.0.1
-
 # Copy the app.py file from the host to the container
 COPY --chown=user:user app.py .