new features

backend/Dockerfile

@@ -1,10 +1,10 @@
 FROM python:3.14-slim
 
-ENV PYTHONDONTWRITEBYTECODE=1     PYTHONUNBUFFERED=1
+ENV PYTHONDONTWRITEBYTECODE=1 PYTHONUNBUFFERED=1
 
 WORKDIR /app
 
-RUN apt-get update && apt-get install -y --no-install-recommends     curl     build-essential     && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y --no-install-recommends ping curl build-essential && rm -rf /var/lib/apt/lists/*
 
 COPY backend/requirements.txt /app/requirements.txt
 RUN pip install --no-cache-dir --upgrade pip && pip install --no-cache-dir -r /app/requirements.txt