feat(server): add CORS support for extension HTTP routes

Enable CORS on the extension HTTP server to allow cross-origin requests
from ATM apps and other web-based clients.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -1,5 +1,6 @@
 import 'dotenv/config'
 import express from 'express'
+import cors from 'cors'
 import path from 'path'
 import { fileURLToPath } from 'url'
 import NewServer from '../proto/autogenerated/ts/express_server.js'
@@ -104,6 +105,7 @@ const start = async () => {
 
     // Create Express app for extension HTTP routes
     const extensionApp = express()
+    extensionApp.use(cors()) // Enable CORS for all origins (ATM apps, wallets, etc.)
     extensionApp.use(express.json())
 
     // Mount extension HTTP routes