chore: 重构 Turbo 构建配置并强化 Bun 专用说明

将应用特定的构建输出配置下沉至各自 turbo.json，根级 build 任务添加拓扑依赖；AGENTS.md 统一添加 Bun 专用运行时警告；桌面端启用 Linux CEF 渲染器。

apps/desktop/AGENTS.md

@@ -2,6 +2,8 @@
 
 Electrobun desktop shell - loads the server app in a native window.
 
+> **⚠️ This project uses Bun — NOT Node.js / npm. All commands use `bun`. Never use `npm`, `npx`, or `node`.**
+
 ## Architecture
 
 - **Type**: Electrobun desktop application
@@ -75,5 +77,6 @@ Electrobun.events.on('will-quit', () => {
 - Handle server startup gracefully
 
 **DON'T:**
+- Use `npm`, `npx`, `node`, `yarn`, `pnpm` — always use `bun` / `bunx`
 - Hardcode dependency versions (use catalog)
 - Block main thread during server wait