feat: add web terminal, improve README, fix node-pty and i18n issues

- Add web terminal view with xterm.js and node-pty WebSocket backend
- Rewrite README with badges, feature table, mobile demo video
- Add package keywords and improved description for npm/GitHub SEO
- Fix node-pty spawn-helper missing execute permission after npm install -g
- Auto-fix node-pty permissions on CLI startup
- Fix duplicate 'error' key in en.ts and zh.ts i18n files
- Remove nested NSpin in PlatformSettings (causes invisible loading spinner)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/index.ts

@@ -14,6 +14,7 @@ import { logRoutes } from './routes/logs'
 import { fsRoutes } from './routes/filesystem'
 import { configRoutes } from './routes/config'
 import { weixinRoutes } from './routes/weixin'
+import { setupTerminalWebSocket } from './routes/terminal'
 import * as hermesCli from './services/hermes-cli'
 import { getToken, authMiddleware } from './services/auth'
 
@@ -94,6 +95,9 @@ export async function bootstrap() {
   // 🚀 启动服务
   server = app.listen(config.port, '0.0.0.0')
 
+  // Terminal WebSocket (must be after server is created)
+  setupTerminalWebSocket(server)
+
   server.on('listening', () => {
     console.log(`➜ Server: http://localhost:${config.port}`)
     console.log(`➜ Upstream: ${config.upstream}`)