Remove backwards compatibility for API responses

- Clean up all backward compatibility checks for old API format
- All endpoints now consistently return { success: true, data: [...] }
- Simplify response handling across all components and pages

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/Footer.tsx

@@ -50,9 +50,7 @@ export default function Footer() {
     try {
       const response = await fetch('/api/counts');
       const data = await response.json();
-      // Handle both old and new API response formats
-      const countsData = data.success ? data.data : data;
-      setCounts(countsData);
+      setCounts(data.data);
     } catch (error) {
       console.error('Failed to fetch counts:', error);
     }