feat: add favicon, structured data & SEO optimization for Google sitelinks

- Add SVG favicon (H logo navy+orange) for all sizes (32, 180, 192, 512)
- Add web manifest (site.webmanifest) for PWA compatibility
- Add theme-color meta tag (#1B2A4A navy)
- Add 3 structured data schemas: LocalBusiness, WebSite, SiteNavigationElement
- WebSite schema enables Google to show site name + search box
- SiteNavigationElement signals main pages for sitelinks display
- Add canonical URLs to all pages (macon, paysagiste, plombier, legal pages)
- Add metadata to pages missing it (mentions-legales, confidentialite, cgv)
- Add candidature/layout.tsx for metadata on client component page
- Optimize sitemap with consistent BASE_URL and candidature/cgv pages
- Add telephone, email, opening hours to LocalBusiness schema

https://claude.ai/code/session_01V8YAjpqRQ3bfBYsABYsEgo

app/macon/page.tsx

@@ -4,9 +4,12 @@ import Button from "@/components/ui/Button";
 import MaconClient from "./MaconClient";
 
 export const metadata: Metadata = {
-  title: "Démo Site Maçon / Couvreur - L'Expertise Solide | HookLab",
+  title: "Démo Site Maçon / Couvreur - L'Expertise Solide",
   description:
     "Modèle de site HookLab pour maçons, couvreurs et charpentiers. Slider Avant/Après interactif, badges garanties, formulaire intelligent, bouton urgence.",
+  alternates: {
+    canonical: "https://hooklab.eu/macon",
+  },
 };
 
 export default function MaconDemo() {