fix(devcontainer): Make config-ui dev server accessible outside the container

when started by listening on 0.0.0.0 with the `--host` flag.
Also ensure it uses port 4000 or fails to start with `--strictPort`
to prevent silent port change that will mismatch with the exported dev container port.

Author: amnir

config-ui/package.json

@@ -4,7 +4,7 @@
   "version": "0.0.0",
   "packageManager": "[email protected]",
   "scripts": {
-    "start": "vite",
+    "start": "vite --host --strictPort",
     "build": "vite build",
     "preview": "vite preview",
     "lint": "tsc && eslint . --fix",