Initialize Harmness Browser JetBrains plugin skeleton

- Gradle + Kotlin + IntelliJ Platform SDK build
- JCEF embedded browser tool window with configurable start URL
- Settings page (Tools > Harmness Browser)
- JS<->Java bridge scaffold (window.harmnessBridge)
- Vite + React + TypeScript web scaffold for embedded page
- README: build, register, upload to Marketplace, install guide

web/vite.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    // 默认端口，与插件 Settings 默认地址一致
+    port: 8888,
+    strictPort: false,
+  },
+  build: {
+    // 输出到插件 resources 目录（可选：也可用 Vite dev server 做开发）
+    outDir: 'dist',
+  },
+})