Add FastAPI service, Dockerfile and compose

webapp/Dockerfile

@@ -0,0 +1,18 @@
+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 PYTHONUNBUFFERED=1
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app ./app
+
+RUN useradd --system --uid 1001 appuser
+USER appuser
+
+EXPOSE 8000
+HEALTHCHECK --interval=15s --timeout=3s --retries=3 \
+  CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')" || exit 1
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]