chore: 初始化 monorepo 项目脚手架

- 配置 pnpm workspace + Turborepo
- 创建 Next.js 15 前端应用 (apps/web)
- 创建 NestJS 10 后端应用 (apps/api)
- 集成 Prisma ORM + Swagger + JWT 认证
- 添加共享包 (packages/shared, eslint-config, typescript-config)
- 添加项目文档 (README, CLAUDE.md, docs/design.md)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "es5",
+  "printWidth": 100
+}