Fix: writable HF caches + OMP threads + libgomp

Dockerfile

@@ -4,6 +4,18 @@ ENV DEBIAN_FRONTEND=noninteractive PIP_NO_CACHE_DIR=1
 WORKDIR /app
 ENV PYTHONPATH=/app/backend:$PYTHONPATH
 
+# OpenMP runtime to avoid missing libgomp issues
+RUN apt-get update && apt-get install -y libgomp1 && rm -rf /var/lib/apt/lists/*
+
+# Writable caches + sane OMP threads
+ENV HF_HOME=/app/.cache \
+    TRANSFORMERS_CACHE=/app/.cache/transformers \
+    HUGGINGFACE_HUB_CACHE=/app/.cache/huggingface \
+    SENTENCE_TRANSFORMERS_HOME=/app/.cache/sentence-transformers \
+    XDG_CACHE_HOME=/app/.cache \
+    OMP_NUM_THREADS=1
+RUN mkdir -p /app/.cache && chmod -R 777 /app/.cache
+
 COPY . .
 
 # Install GPU-ready deps