chore(dashboard): Add standalone build script to package.json

packages/dashboard/package.json

@@ -14,6 +14,7 @@
     },
     "scripts": {
         "dev": "vite",
+        "build:standalone": "vite build",
         "build": "tsc --project tsconfig.plugin.json",
         "watch": "tsc --project tsconfig.plugin.json --watch",
         "test": "vitest run",