refactor: 迁移至 electron-vite 官方推荐目录结构

- electron/* -> src/main/* (主进程)
- electron/preload.ts -> src/preload/index.ts (预加载)
- src/electron-api.d.ts -> src/preload/index.d.ts (类型声明)
- src/* -> src/renderer/src/* (渲染进程)
- src/index.html -> src/renderer/index.html
- electron.vite.config.ts 简化为自动入口检测 (零配置)
- tsconfig.app.json -> tsconfig.web.json, 更新 includes/paths
- 构建产物 dist-electron/ -> out/ (修复 main/preload 输出覆盖 bug)
- 更新 package.json main 字段 + electron-builder files
- 更新 .gitignore + eslint ignores
- 更新 AGENTS.md 架构文档

src/main/index.ts

@@ -0,0 +1,65 @@
+import { app, BrowserWindow, nativeTheme, nativeImage } from 'electron'
+import { join } from 'path'
+import { restoreAndTrack } from './win-state'
+import { registerIpcHandlers } from './ipc-handlers'
+import { initUpdater } from './updater'
+
+let mainWindow: BrowserWindow | null = null
+
+function getIconPath(): string {
+  return join(__dirname, '../../build/icons/icon_256.png')
+}
+
+function createWindow(): void {
+  const iconPath = getIconPath()
+
+  mainWindow = new BrowserWindow({
+    width: 1200,
+    height: 800,
+    minWidth: 900,
+    minHeight: 600,
+    title: 'JRedisDesktop',
+    icon: nativeImage.createFromPath(iconPath),
+    backgroundColor: nativeTheme.shouldUseDarkColors ? '#0f0f1a' : '#f8fafc',
+    webPreferences: {
+      preload: join(__dirname, '../preload/index.mjs'),
+      contextIsolation: true,
+      nodeIntegration: false,
+      sandbox: false,
+    },
+    frame: false,
+    titleBarStyle: 'hidden',
+    transparent: true,
+  })
+
+  // Linux taskbar icon
+  if (process.platform === 'linux' && mainWindow) {
+    mainWindow.setIcon(nativeImage.createFromPath(iconPath))
+  }
+
+  restoreAndTrack(mainWindow)
+
+  if (process.env.ELECTRON_RENDERER_URL) {
+    mainWindow.loadURL(process.env.ELECTRON_RENDERER_URL)
+  } else {
+    mainWindow.loadFile(join(__dirname, '../renderer/index.html'))
+  }
+
+  mainWindow.on('closed', () => { mainWindow = null })
+
+  nativeTheme.on('updated', () => {
+    mainWindow?.webContents.send('theme:os-updated', nativeTheme.shouldUseDarkColors)
+  })
+}
+
+app.whenReady().then(() => {
+  registerIpcHandlers()
+  createWindow()
+  initUpdater(mainWindow!)
+})
+
+app.on('window-all-closed', () => { app.quit() })
+
+app.on('activate', () => {
+  if (BrowserWindow.getAllWindows().length === 0) createWindow()
+})