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/components/home/ExitIntentDetector.tsx

@@ -32,11 +32,17 @@ export default function ExitIntentDetector() {
       try {
         const response = await fetch("/api/geoip");
         if (response.ok) {
-          const data = await response.json();
-          setCountry(data.country);
-          setCountryCode(data.countryCode);
-          setCity(data.city || "");
-          setRegion(data.region || "");
+          const contentType = response.headers.get("content-type");
+          if (contentType && contentType.includes("application/json")) {
+            const text = await response.text();
+            if (text && text.trim()) {
+              const data = JSON.parse(text);
+              setCountry(data.country);
+              setCountryCode(data.countryCode);
+              setCity(data.city || "");
+              setRegion(data.region || "");
+            }
+          }
         }
       } catch (error) {
         console.error("Failed to get country:", error);