chore: add Docker support for HuggingFace Spaces

Dockerfile

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+FROM python:3.11-slim
+
+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
+
+COPY app/ ./app/
+COPY tests/ ./tests/
+
+EXPOSE 7860
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "7860"]