feat: bootstrap secure cross-platform assistant

Establish the Electron foundation and pluggable agent runtime so desktop workflows can evolve safely across supported platforms.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

electron.vite.config.ts

@@ -0,0 +1,29 @@
+import { resolve } from 'node:path'
+import react from '@vitejs/plugin-react'
+import { defineConfig, externalizeDepsPlugin } from 'electron-vite'
+
+export default defineConfig({
+  main: {
+    plugins: [externalizeDepsPlugin()]
+  },
+  preload: {
+    plugins: [externalizeDepsPlugin()],
+    build: {
+      rollupOptions: {
+        output: {
+          entryFileNames: '[name].cjs',
+          format: 'cjs'
+        }
+      }
+    }
+  },
+  renderer: {
+    resolve: {
+      alias: {
+        '@renderer': resolve('src/renderer/src'),
+        '@shared': resolve('src/shared')
+      }
+    },
+    plugins: [react()]
+  }
+})