chore: 初始化项目结构并添加基础配置文件

添加后端API和前端项目的初始目录结构，包括应用层模块、工具模块和模型定义
配置前后端的.dockerignore文件以排除开发环境文件
添加前端样式文件，包括字体、Tailwind CSS和主题配置
初始化Python虚拟环境中的类型标记文件

前端-孕期报告解读-figma/postcss.config.mjs

@@ -0,0 +1,15 @@
+/**
+ * PostCSS Configuration
+ *
+ * Tailwind CSS v4 (via @tailwindcss/vite) automatically sets up all required
+ * PostCSS plugins — you do NOT need to include `tailwindcss` or `autoprefixer` here.
+ *
+ * This file only exists for adding additional PostCSS plugins, if needed.
+ * For example:
+ *
+ * import postcssNested from 'postcss-nested'
+ * export default { plugins: [postcssNested()] }
+ *
+ * Otherwise, you can leave this file empty.
+ */
+export default {}