fix: default to no llm mode

Dockerfile

@@ -5,18 +5,12 @@ WORKDIR /app
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-ARG MOCK_LLM=false
-ENV MOCK_LLM=${MOCK_LLM}
-
-RUN if [ "$MOCK_LLM" != "true" ]; then \
-    pip install llama-cpp-python --no-cache-dir && \
-    mkdir -p /models && \
-    python -c "from huggingface_hub import hf_hub_download; hf_hub_download('bartowski/Qwen2.5-0.5B-Instruct-GGUF', 'Qwen2.5-0.5B-Instruct-Q4_K_M.gguf', local_dir='/models')"; \
-fi
+# Default to mock mode for HF Spaces (no GPU available)
+ENV MOCK_LLM=true
 
 COPY app/ ./app/
 COPY tests/ ./tests/
 
 EXPOSE 7860
 
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]