fix: add curl for healthcheck, PYTHONUNBUFFERED for logging

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -6,7 +6,7 @@ COPY dashboard/ .
 RUN npm run build
 
 FROM python:3.12-alpine
-RUN apk add --no-cache postgresql-client
+RUN apk add --no-cache postgresql-client curl
 WORKDIR /app
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
@@ -14,5 +14,6 @@ COPY app_server.py .
 COPY --from=dashboard-build /dashboard/dist /app/dashboard/dist
 ENV PORT=8080
 ENV DIST_DIR=/app/dashboard/dist
+ENV PYTHONUNBUFFERED=1
 EXPOSE 8080
 CMD ["python", "app_server.py"]