feat: Stripe Payment Links für Buchungen (Testmodus)

- Privatperson (79 EUR): Stripe Payment Link
- Gruppe (600 EUR): Stripe Payment Link
- Premium (1490 EUR): Stripe Payment Link

Testmodus aktiv - Live-Keys müssen später ausgetauscht werden.

🤖 Generated with Claude Code

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

src/App.tsx

@@ -439,10 +439,12 @@ function App() {
                 </ul>
 
                 <a
-                  href="#booking"
+                  href="https://buy.stripe.com/test_4gM8wOfv2chEcf83XGebu00"
+                  target="_blank"
+                  rel="noopener noreferrer"
                   className="block w-full text-center border-2 border-green-500 text-green-500 font-bold px-6 py-3 rounded-lg hover:bg-green-50 transition-colors duration-300"
                 >
-                  Zur Buchung
+                  Jetzt Buchen
                 </a>
               </div>
             </div>
@@ -491,7 +493,9 @@ function App() {
                 </ul>
 
                 <a
-                  href="#booking"
+                  href="https://buy.stripe.com/test_5kQ00ibeM95sbb4eCkebu01"
+                  target="_blank"
+                  rel="noopener noreferrer"
                   className="block w-full text-center bg-green-500 text-white font-bold px-6 py-3 rounded-lg hover:bg-green-600 transition-colors duration-300"
                 >
                   Gruppe Buchen
@@ -538,7 +542,9 @@ function App() {
                 </ul>
 
                 <a
-                  href="#booking"
+                  href="https://buy.stripe.com/test_aFa8wObeMa9wfrk9i0ebu02"
+                  target="_blank"
+                  rel="noopener noreferrer"
                   className="block w-full text-center border-2 border-green-500 text-green-500 font-bold px-6 py-3 rounded-lg hover:bg-green-50 transition-colors duration-300"
                 >
                   Premium Buchen