perf: fix TBT/LCP/a11y — disable shader animation, cache APIs, fix images

Co-authored-by: denshooter <44590296+denshooter@users.noreply.github.com>

app/api/book-reviews/route.ts

@@ -3,7 +3,9 @@ import { getBookReviews } from '@/lib/directus';
 import { checkRateLimit, getClientIp } from '@/lib/auth';
 
 export const runtime = 'nodejs';
-export const dynamic = 'force-dynamic';
+export const revalidate = 300;
+
+const CACHE_TTL = 300; // 5 minutes
 
 /**
  * GET /api/book-reviews
@@ -25,31 +27,29 @@ export async function GET(request: NextRequest) {
     const locale = searchParams.get('locale') || 'en';
 
     const reviews = await getBookReviews(locale);
-    
+
     if (process.env.NODE_ENV === 'development') {
       console.log(`[API] Book Reviews geladen für ${locale}:`, reviews?.length || 0);
     }
 
     if (reviews && reviews.length > 0) {
-      return NextResponse.json({
-        bookReviews: reviews,
-        source: 'directus'
-      });
+      return NextResponse.json(
+        { bookReviews: reviews, source: 'directus' },
+        { headers: { 'Cache-Control': `public, s-maxage=${CACHE_TTL}, stale-while-revalidate=${CACHE_TTL * 2}` } }
+      );
     }
 
-    return NextResponse.json({
-      bookReviews: null,
-      source: 'fallback'
-    });
+    return NextResponse.json(
+      { bookReviews: null, source: 'fallback' },
+      { headers: { 'Cache-Control': `public, s-maxage=${CACHE_TTL}, stale-while-revalidate=${CACHE_TTL * 2}` } }
+    );
 
   } catch (error) {
-    console.error('Error loading book reviews:', error);
+    if (process.env.NODE_ENV === 'development') {
+      console.error('Error loading book reviews:', error);
+    }
     return NextResponse.json(
-      {
-        bookReviews: null,
-        error: 'Failed to load book reviews',
-        source: 'error'
-      },
+      { bookReviews: null, error: 'Failed to load book reviews', source: 'error' },
       { status: 500 }
     );
   }