docs: restructure Build section into Data / Interface / Automation subgroups

Move data-model, views, actions, and flows (all locales) into nested
sidebar groups so the Build section stays scannable as it grows.
Update all internal links, localized meta.json files, and add
permanent redirects for the four moved URLs.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0145MY7RdJr8KuRMyn5oKAR6

Author: claude

apps/docs/next-env.d.ts

@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/types/routes.d.ts";
+import "./.next/dev/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

apps/docs/next.config.mjs

@@ -28,6 +28,19 @@ const config = {
       },
     ],
   },
+  async redirects() {
+    // Build section restructure: pages moved into data/, interface/, automation/ subgroups.
+    const moved = [
+      ['/docs/build/data-model', '/docs/build/data'],
+      ['/docs/build/views', '/docs/build/interface/views'],
+      ['/docs/build/actions', '/docs/build/interface/actions'],
+      ['/docs/build/flows', '/docs/build/automation/flows'],
+    ];
+    return moved.flatMap(([source, destination]) => [
+      { source, destination, permanent: true },
+      { source: `/:lang${source}`, destination: `/:lang${destination}`, permanent: true },
+    ]);
+  },
   async rewrites() {
     return [
       {