feat: enable CORS and add frontend API test page

backend/src/main.ts

@@ -3,7 +3,10 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-
+app.enableCors({
+    origin: 'http://localhost:3000',
+    credentials: true,
+  });
   const port = process.env.PORT || 3001;
   await app.listen(port);
 

frontend/app/test/page.tsx

@@ -0,0 +1,63 @@
+'use client';
+
+import { useEffect } from 'react';
+
+export default function TestPage() {
+  useEffect(() => {
+    console.log('--- FE TEST START ---');
+
+    // Feed testen
+    fetch('http://localhost:3001/feed')
+      .then(res => res.json())
+      .then(data => {
+        console.log('FEED RESPONSE:', data);
+      })
+      .catch(err => {
+        console.error('FEED ERROR:', err);
+      });
+
+    // Öffentliches Pet testen
+    fetch('http://localhost:3001/pets/2')
+      .then(async res => {
+        if (res.status === 403) {
+          console.log('PET 2: FORBIDDEN');
+          return;
+        }
+        const data = await res.json();
+        console.log('PET 2 RESPONSE:', data);
+      })
+      .catch(err => {
+        console.error('PET 2 ERROR:', err);
+      });
+
+    // Followers-Pet testen (soll 403 geben)
+    fetch('http://localhost:3001/pets/5')
+      .then(async res => {
+        if (res.status === 403) {
+          console.log('PET 5: FORBIDDEN (expected)');
+          return;
+        }
+        const data = await res.json();
+        console.log('PET 5 RESPONSE:', data);
+      })
+      .catch(err => {
+        console.error('PET 5 ERROR:', err);
+      });
+  }, []);
+
+  return (
+    <section style={{ padding: '2rem' }}>
+      <h1>🧪 Frontend API Test</h1>
+      <p>
+        Diese Seite dient nur zum Testen der Backend-APIs.
+        <br />
+        👉 Öffne die <strong>Browser-Konsole</strong>.
+      </p>
+      <ul>
+        <li>Feed wird geladen</li>
+        <li>Pet 2 (public) wird geladen</li>
+        <li>Pet 5 (followers) sollte 403 sein</li>
+      </ul>
+    </section>
+  );
+}