feat: implement programmatic SEO solutions hub

- Add /solutions hub page with 10 category cards
- Add /solutions/by-concern directory page
- Add /solutions/by-oil directory page
- Add Solutions section to Footer with navigation links
- Add Breadcrumb component for solution pages
- Add translations for all solution pages (sr, en, de, fr)
- Fix ExitIntentDetector JSON parsing error
- Update sitemap with solution pages
- Create 3 sample solution pages with data files

src/lib/programmatic-seo/schema.ts

@@ -0,0 +1,30 @@
+export interface FAQPageSchema {
+  "@context": "https://schema.org";
+  "@type": "FAQPage";
+  mainEntity: Array<{
+    "@type": "Question";
+    name: string;
+    acceptedAnswer: {
+      "@type": "Answer";
+      text: string;
+    };
+  }>;
+}
+
+export function generateFAQPageSchema(
+  questions: Array<{ question: string; answer: string }>
+): FAQPageSchema {
+  return {
+    "@context": "https://schema.org",
+    "@type": "FAQPage",
+    mainEntity: questions.map((q) => ({
+      "@type": "Question",
+      name: q.question,
+      acceptedAnswer: {
+        "@type": "Answer",
+        text: q.answer,
+      },
+    })),
+  };
+}
+