chore: initial backend + travel-proxy dockerized setup for NAS deployment

travel-proxy/Dockerfile

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+FROM python:3.12-slim
+
+# Pillow용 시스템 라이브러리
+RUN apt-get update && apt-get install -y \
+    libjpeg-dev \
+    zlib1g-dev \
+    libpng-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app /app/app
+
+ENV TRAVEL_ROOT=/data/travel
+EXPOSE 8000
+
+ENV PYTHONUNBUFFERED=1
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]