restructure files onto electron-vite boilerplate

src/preload/index.d.ts

@@ -0,0 +1,10 @@
+import { ElectronAPI } from '@electron-toolkit/preload';
+
+import { PreloadApi } from './index';
+
+declare global {
+    interface Window {
+        api: PreloadApi;
+        electron: ElectronAPI;
+    }
+}