Add health check.

Dockerfile

@@ -1,6 +1,10 @@
 FROM python:3.13-slim-bookworm
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
 
+# add curl for Coolify's healthcheck
+RUN apt-get update && apt-get install -y --no-install-recommends curl \
+    && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /app
 
 COPY pyproject.toml uv.lock ./