refactor: Use dedicated WebSocket server for torch sync

- Add torch WebSocket server on port 4106
- Remove HTTP polling, use WebSocket for instant sync
- Torch state changes broadcast immediately to all clients
- Auto-reconnect on disconnect
- Add port 4106 to kill-ports script

package.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Dynamic canvas for Claude Code interaction",
   "scripts": {
-    "kill-ports": "node -e \"const {execSync} = require('child_process'); [4101,4102,4103,4105].forEach(p => { try { const pid = execSync('netstat -ano | findstr :' + p + ' | findstr LISTENING', {encoding:'utf8'}).split(/\\s+/).pop().trim(); if(pid) execSync('taskkill /PID ' + pid + ' /F', {stdio:'ignore'}); } catch(e){} }); console.log('Ports cleared');\"",
+    "kill-ports": "node -e \"const {execSync} = require('child_process'); [4101,4102,4103,4105,4106].forEach(p => { try { const pid = execSync('netstat -ano | findstr :' + p + ' | findstr LISTENING', {encoding:'utf8'}).split(/\\s+/).pop().trim(); if(pid) execSync('taskkill /PID ' + pid + ' /F', {stdio:'ignore'}); } catch(e){} }); console.log('Ports cleared');\"",
     "start": "bun run kill-ports && concurrently -n api,terminal,frontend -c blue,yellow,green \"cd server && bun --watch run index.ts\" \"cd server && bun run terminal.ts\" \"cd frontend && bun run dev --host\"",
     "start:api": "cd server && bun --watch run index.ts",
     "start:terminal": "cd server && bun run terminal.ts",