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

public/apple-touch-icon.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 180 180" width="180" height="180">
+  <rect width="180" height="180" rx="32" fill="#1B2A4A"/>
+  <text x="90" y="130" text-anchor="middle" font-family="Inter, Arial, sans-serif" font-weight="800" font-size="120" fill="#FFFFFF">H</text>
+  <rect x="105" y="35" width="22" height="22" rx="5" fill="#E8772E"/>
+</svg>

public/favicon.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" width="32" height="32">
+  <rect width="32" height="32" rx="6" fill="#1B2A4A"/>
+  <text x="16" y="23" text-anchor="middle" font-family="Inter, Arial, sans-serif" font-weight="800" font-size="20" fill="#FFFFFF">H</text>
+  <rect x="18" y="7" width="4" height="4" rx="1" fill="#E8772E"/>
+</svg>

public/icon-192.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 192 192" width="192" height="192">
+  <rect width="192" height="192" rx="32" fill="#1B2A4A"/>
+  <text x="96" y="137" text-anchor="middle" font-family="Inter, Arial, sans-serif" font-weight="800" font-size="128" fill="#FFFFFF">H</text>
+  <rect x="112" y="37" width="24" height="24" rx="5" fill="#E8772E"/>
+</svg>

public/icon-512.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" width="512" height="512">
+  <rect width="512" height="512" rx="64" fill="#1B2A4A"/>
+  <text x="256" y="365" text-anchor="middle" font-family="Inter, Arial, sans-serif" font-weight="800" font-size="340" fill="#FFFFFF">H</text>
+  <rect x="295" y="95" width="60" height="60" rx="12" fill="#E8772E"/>
+</svg>

public/site.webmanifest

@@ -0,0 +1,21 @@
+{
+  "name": "HookLab - Sites web pour artisans du Nord",
+  "short_name": "HookLab",
+  "description": "Création de sites internet et référencement Google pour artisans du bâtiment dans le Nord (59).",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#F7F8FA",
+  "theme_color": "#1B2A4A",
+  "icons": [
+    {
+      "src": "/icon-192.svg",
+      "sizes": "192x192",
+      "type": "image/svg+xml"
+    },
+    {
+      "src": "/icon-512.svg",
+      "sizes": "512x512",
+      "type": "image/svg+xml"
+    }
+  ]
+}