feat(seo): fix titles, canonicals, share tags and soft 404s

- Titles carried the brand twice (page title plus layout template) and Pudu
  items read "Pudu PUDU". Pages now go through pageMetadata() and displayName().
- /configure, /privacy-policy and /terms-of-service reused the homepage title.
- Eight pages had no canonical and inherited the homepage og:url.
- Unknown /robots, /accessories and /industries slugs returned 200; they are
  now a real 404 (dynamicParams = false) with a not-found page.
- Events, Smart Buildings and Government have no page content yet and rendered
  not-found: moved to UPCOMING_INDUSTRIES until it is written.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/book-demo/page.tsx

@@ -2,12 +2,14 @@ import type { Metadata } from 'next';
 import { Navbar } from '@/components/Navbar';
 import { FooterAndContact } from '@/components/FooterAndContact';
 import { InquiryForm } from '@/components/robotics/InquiryForm';
+import { pageMetadata } from '@/lib/seo';
 
-export const metadata: Metadata = {
-  title: 'Book a Robotics Demo in Dubai YS Lootah Robotics',
+export const metadata: Metadata = pageMetadata({
+  title: 'Book a Robotics Demo in Dubai',
   description:
     'Book a live robot demo at our Dubai showroom or at your venue. See selected Unitree and Pudu Robotics solutions in action, available in the UAE through YS Lootah Robotics.',
-};
+  path: '/book-demo/',
+});
 
 export default function BookDemoPage() {
   return (