feat: add Dockerfile targeting port 7860 for HuggingFace Spaces

Dockerfile

@@ -0,0 +1,24 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# System deps
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Python deps first (cached layer)
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy source
+COPY . .
+
+# Non-root user (HuggingFace Spaces requirement)
+RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
+USER appuser
+
+# HuggingFace Spaces uses port 7860
+EXPOSE 7860
+
+CMD ["uvicorn", "server.app:app", "--host", "0.0.0.0", "--port", "7860"]