feat(seo): robots.txt, richer sitemap, llms.txt, manifest, OG image, JSON-LD

- Add app/robots.ts (allow crawl, disallow admin/api, sitemap URL)
- Expand sitemap to industries/[slug], accessories/[slug] and more static routes
- Add public/llms.txt (AI summary), site.webmanifest, 1200x630 og.jpg
- Layout: default OG/Twitter image, manifest, robots meta, Organization + WebSite JSON-LD
- Robot pages: canonical, OG image, Product + BreadcrumbList JSON-LD; home canonical

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/layout.tsx

@@ -1,6 +1,8 @@
 import type { Metadata, Viewport } from "next";
 import { ErrorBoundary } from "@/components/ErrorBoundary";
 import { I18nProvider } from "@/components/I18nProvider";
+import JsonLd from "@/components/JsonLd";
+import { OG_IMAGE, siteName, organizationJsonLd, websiteJsonLd } from "@/lib/seo";
 import "./globals.css";
 
 export const metadata: Metadata = {
@@ -28,17 +30,32 @@ export const metadata: Metadata = {
   ],
   openGraph: {
     type: 'website',
+    url: '/',
     title: 'YS Lootah Robotics UAE Destination for Unitree & Pudu Robotics',
     description:
       'Advanced robotics. UAE access. Selected Unitree and Pudu solutions available through YS Lootah Robotics in Dubai.',
     locale: 'en_AE',
     siteName: 'YS Lootah Robotics',
+    images: [{ url: OG_IMAGE, width: 1200, height: 630, alt: siteName }],
   },
   twitter: {
     card: 'summary_large_image',
     title: 'YS Lootah Robotics UAE Destination for Unitree & Pudu Robotics',
     description:
       'The UAE’s dedicated destination for Unitree and Pudu Robotics sales, demo inquiries, and business deployment.',
+    images: [OG_IMAGE],
+  },
+  manifest: '/site.webmanifest',
+  robots: {
+    index: true,
+    follow: true,
+    googleBot: {
+      index: true,
+      follow: true,
+      'max-image-preview': 'large',
+      'max-snippet': -1,
+      'max-video-preview': -1,
+    },
   },
 };
 
@@ -63,6 +80,7 @@ export default function RootLayout({
         <link href="https://fonts.googleapis.com/css2?family=Inter:wght@200;300;400;500;600;700&display=swap" rel="stylesheet" />
       </head>
       <body suppressHydrationWarning>
+        <JsonLd data={[organizationJsonLd, websiteJsonLd]} />
         <ErrorBoundary>
           <I18nProvider>
             {children}