Ajout du schema JSON-LD BreadcrumbList sur les pages internes

Fil d'Ariane automatique basé sur le pathname : Accueil → Section → Sous-page. Adapté aux 3 langues (Accueil/Home/الرئيسية). Absent sur les pages d'accueil.

src/components/SEO.astro

@@ -92,6 +92,37 @@ const articleJsonLd =
       }
     : null;
 
+// BreadcrumbList JSON-LD (all pages except home)
+const breadcrumbJsonLd = !isHomePage
+  ? (() => {
+      const segments = pathname.split("/").filter(Boolean);
+      // Build cumulative paths: /en/code → [{name: "Home", url: /en}, {name: "Code", url: /en/code}]
+      const homeUrl = locale === "fr" ? "/" : `/${locale}`;
+      const homeName = locale === "ar" ? "الرئيسية" : locale === "en" ? "Home" : "Accueil";
+      const items = [{ name: homeName, url: new URL(homeUrl, siteUrl).href }];
+      // Skip locale prefix for building readable names
+      const startIdx = locale !== "fr" ? 1 : 0;
+      let cumulativePath = locale !== "fr" ? `/${locale}` : "";
+      for (let i = startIdx; i < segments.length; i++) {
+        cumulativePath += `/${segments[i]}`;
+        const name = decodeURIComponent(segments[i])
+          .replace(/-/g, " ")
+          .replace(/^\w/, (c) => c.toUpperCase());
+        items.push({ name, url: new URL(cumulativePath, siteUrl).href });
+      }
+      return {
+        "@context": "https://schema.org",
+        "@type": "BreadcrumbList",
+        itemListElement: items.map((item, i) => ({
+          "@type": "ListItem",
+          position: i + 1,
+          name: item.name,
+          item: item.url,
+        })),
+      };
+    })()
+  : null;
+
 // WebSite JSON-LD (only on home pages)
 const websiteJsonLd = isHomePage
   ? {
@@ -150,6 +181,11 @@ const websiteJsonLd = isHomePage
   <script type="application/ld+json" set:html={JSON.stringify(articleJsonLd)} />
 )}
 
+<!-- JSON-LD BreadcrumbList (inner pages only) -->
+{breadcrumbJsonLd && (
+  <script type="application/ld+json" set:html={JSON.stringify(breadcrumbJsonLd)} />
+)}
+
 <!-- JSON-LD WebSite (home pages only) -->
 {websiteJsonLd && (
   <script type="application/ld+json" set:html={JSON.stringify(websiteJsonLd)} />