refactor(desktop): 从 Tauri 迁移到 Electrobun

- 移除 Tauri v2 代码 (src-tauri/, copy.ts)
- 添加 Electrobun 配置和入口 (electrobun.config.ts, src/bun/index.ts)
- 更新 package.json 使用 catalog 管理 electrobun 依赖
- 移除 server 中的 @tauri-apps/api 依赖
- 更新 AGENTS.md 文档

apps/desktop/src/bun/index.ts

@@ -0,0 +1,49 @@
+import Electrobun, { BrowserWindow } from 'electrobun/bun'
+
+const DEV_SERVER_URL = 'http://localhost:3000'
+
+async function waitForServer(url: string, timeoutMs = 30000): Promise<boolean> {
+  const start = Date.now()
+  while (Date.now() - start < timeoutMs) {
+    try {
+      const response = await fetch(url, { method: 'HEAD' })
+      if (response.ok) return true
+    } catch {
+      await Bun.sleep(100)
+    }
+  }
+  return false
+}
+
+async function main() {
+  console.log('Starting Furtherverse Desktop...')
+  console.log('Waiting for dev server at', DEV_SERVER_URL)
+
+  const ready = await waitForServer(DEV_SERVER_URL)
+  if (!ready) {
+    console.error(
+      'Dev server not responding. Make sure to run: cd apps/server && bun dev',
+    )
+    process.exit(1)
+  }
+
+  console.log('Dev server ready!')
+
+  new BrowserWindow({
+    title: 'Furtherverse',
+    url: DEV_SERVER_URL,
+    frame: {
+      x: 100,
+      y: 100,
+      width: 1200,
+      height: 800,
+    },
+  })
+
+  Electrobun.events.on('will-quit', () => console.log('Quitting...'))
+}
+
+main().catch((error) => {
+  console.error('Failed to start:', error)
+  process.exit(1)
+})