fix(docs): build docs as fully static output for Cloudflare Pages

nuxt build with the cloudflare_pages preset emits a _worker.js (advanced
mode), and Cloudflare Pages ignores _redirects/_headers whenever a
_worker.js is present — so the legacy 301 redirects returned 404 on the
deployed site. Switch the build script to nuxt generate, which produces a
purely static dist/ with no worker, making _redirects/_headers authoritative
(matching the previous netlify-static behavior).

Author: binaryk

docs-v3/package.json

@@ -6,7 +6,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "build": "nuxt build",
+    "build": "nuxt generate",
     "dev": "nuxt dev",
     "generate": "nuxt generate",
     "preview": "nuxt preview",