v2 message format and upgrade to ai sdk v5 (#743)

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Liang-Shih Lin <liangshihlin@proton.me>
Co-authored-by: Dominik Engelhardt <dominikengelhardt@ymail.com>
Co-authored-by: Jay V <air@live.ca>
Co-authored-by: adamdottv <2363879+adamdottv@users.noreply.github.com>

packages/web/package.json

@@ -4,6 +4,7 @@
   "version": "0.0.1",
   "scripts": {
     "dev": "astro dev",
+    "dev:remote": "sst shell --stage=dev --target=Web astro dev",
     "start": "astro dev",
     "build": "astro build",
     "preview": "astro preview",