refactor: project restructuring - migrate to modular directory layout

- Move root-level docs into docs/ directory
- Move config files into config/ directory
- Move docker files into docker/ directory
- Move test scripts into tests/ directory
- Remove .env from tracking (use .env.example as template)
- Remove .venv/ from tracking (use requirements.txt)
- Add Vue3 frontend app (vue-app/)
- Add new routes: upload, user_templates, meeting_minutes, etc.
- Add database migrations for prompt_template additions
- Fix load_dotenv() to use absolute path for Flask reloader compatibility

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker/Dockerfile.log-manager

@@ -0,0 +1,26 @@
+FROM python:3.12-slim
+
+# 设置工作目录
+WORKDIR /app
+
+# 复制日志管理相关文件
+COPY log_manager.py .
+COPY requirements.txt .
+
+# 安装Python依赖
+RUN pip install --no-cache-dir -r requirements.txt
+
+# 创建日志目录
+RUN mkdir -p /app/logs
+
+# 设置环境变量
+ENV PYTHONPATH=/app
+
+# 创建定时任务
+RUN echo "0 2 * * * cd /app && python log_manager.py" > /etc/cron.d/log-maintenance
+
+# 安装cron
+RUN apt-get update && apt-get install -y cron && rm -rf /var/lib/apt/lists/*
+
+# 启动cron和日志管理
+CMD ["sh", "-c", "cron && python log_manager.py"]