feat(build): bundle frontend with vite and matrix-js-sdk, fix HOST in server.js

package.json

@@ -4,6 +4,7 @@
   "version": "0.1.0",
   "description": "Discord-clone POC: WebRTC voice chat + screen sharing + spatial audio",
   "scripts": {
+    "build": "vite build",
     "start": "node server.js",
     "test": "node --test"
   },
@@ -16,6 +17,16 @@
     "@opentelemetry/sdk-logs": "^0.222.0",
     "@opentelemetry/sdk-node": "^0.222.0",
     "@opentelemetry/semantic-conventions": "^1.43.0",
+    "matrix-js-sdk": "^42.4.0",
     "ws": "^8.18.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-basic-ssl": "^2.3.0",
+    "esbuild": "^0.28.2",
+    "vite": "^8.3.0",
+    "vite-plugin-node-polyfills": "^0.28.0"
+  },
+  "allowScripts": {
+    "esbuild@0.28.2": true
   }
 }