Add Dockerfile for HF deployment

Dockerfile

@@ -0,0 +1,21 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# System deps
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python deps
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy app
+COPY . .
+
+# Expose port
+EXPOSE 7860
+
+# Start FastAPI
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]