feat: 初始化导航网站项目

添加 Flask 导航站应用，包含 Docker 部署配置、SQLite 数据库、静态资源及 CI/CD 流水线。

Dockerfile

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+FROM python:3.9-slim
+# Keeps Python from generating .pyc files in the container
+ENV PYTHONDONTWRITEBYTECODE=1
+# Turns off buffering for easier container logging
+ENV PYTHONUNBUFFERED=1
+ADD . /navi
+WORKDIR /navi
+# 安装依赖
+RUN python -m pip install --no-cache-dir --upgrade -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
+EXPOSE 18100
+CMD ["python", "/navi/run.py"]