feat(core): initialize project skeleton with Electron + React + TypeScript

Set up the complete project foundation for ClawX, a graphical AI assistant:

- Electron main process with IPC handlers, menu, tray, and gateway management
- React renderer with routing, layout components, and page scaffolding
- Zustand state management for gateway, settings, channels, skills, chat, and cron
- shadcn/ui components with Tailwind CSS and CSS variable theming
- Build tooling with Vite, electron-builder, and TypeScript configuration
- Testing setup with Vitest and Playwright
- Development configurations (ESLint, Prettier, gitignore, env example)

vite.config.ts

@@ -0,0 +1,58 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import electron from 'vite-plugin-electron';
+import renderer from 'vite-plugin-electron-renderer';
+import { resolve } from 'path';
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [
+    react(),
+    electron([
+      {
+        // Main process entry file
+        entry: 'electron/main/index.ts',
+        onstart(options) {
+          options.startup();
+        },
+        vite: {
+          build: {
+            outDir: 'dist-electron/main',
+            rollupOptions: {
+              external: ['electron', 'electron-store', 'electron-updater', 'ws'],
+            },
+          },
+        },
+      },
+      {
+        // Preload scripts entry file
+        entry: 'electron/preload/index.ts',
+        onstart(options) {
+          options.reload();
+        },
+        vite: {
+          build: {
+            outDir: 'dist-electron/preload',
+            rollupOptions: {
+              external: ['electron'],
+            },
+          },
+        },
+      },
+    ]),
+    renderer(),
+  ],
+  resolve: {
+    alias: {
+      '@': resolve(__dirname, 'src'),
+      '@electron': resolve(__dirname, 'electron'),
+    },
+  },
+  server: {
+    port: 5173,
+  },
+  build: {
+    outDir: 'dist',
+    emptyOutDir: true,
+  },
+});