feat: add Dockerfile for HuggingFace Spaces deployment

Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git curl build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies first (layer caching)
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy project code
+COPY . .
+
+# Expose API port (HuggingFace Spaces uses 7860)
+EXPOSE 7860
+
+# Start FastAPI
+CMD ["uvicorn", "api.main:app", "--host", "0.0.0.0", "--port", "7860"]