refactor(types): move shared types from renderer to shared directory

- Move type definitions from src/renderer/src/types/ to src/shared/types/
- Add @shared/* path alias to tsconfig.node.json and tsconfig.web.json
- Update all imports from @renderer/types/* to @shared/types/*
- Update AGENTS.md with new directory structure and path alias

This fixes architecture violation where main/preload processes imported
from renderer directory. Types are now properly shared across all processes.

AGENTS.md

@@ -38,13 +38,14 @@ src/
 ├── preload/        # Preload 脚本
 │   ├── index.ts          # 暴露 API 到渲染进程
 │   └── index.d.ts        # 类型声明
+├── shared/         # 跨进程共享代码
+│   └── types/            # 共享类型定义
 └── renderer/       # React 渲染进程
     └── src/
         ├── main.tsx      # React 入口
         ├── App.tsx       # 根组件
         ├── components/   # React 组件
-        ├── stores/       # Zustand Stores
-        └── types/        # TypeScript 类型
+        └── stores/       # Zustand Stores
 ```
 
 ## 3. 路径别名
@@ -54,7 +55,7 @@ src/
 | `@renderer/*` | `src/renderer/src/*` |
 | `@main/*`     | `src/main/*`         |
 | `@preload/*`  | `src/preload/*`      |
-
+| `@shared/*`   | `src/shared/*`       |
 ## 4. 代码风格
 
 ### 导入顺序