Enhance debug logging for Passkey Registration options

Add detailed debug statements in the registrieren.vue component to validate the complete options structure during Passkey registration. Update the register-passkey API to simplify the options return process, eliminating unnecessary serialization while maintaining comprehensive logging of the options details for improved troubleshooting.

pages/registrieren.vue

@@ -444,6 +444,28 @@ const handleRegisterWithPasskey = async () => {
       throw new Error('Ungültige WebAuthn-Options vom Server')
     }
     
+    // Debug: Prüfe die vollständige Options-Struktur
+    console.log('[DEBUG] Full options structure check:', {
+      hasChallenge: !!pre.options.challenge,
+      challengeValue: pre.options.challenge?.substring(0, 20) + '...',
+      challengeType: typeof pre.options.challenge,
+      hasRp: !!pre.options.rp,
+      rpId: pre.options.rp?.id,
+      rpName: pre.options.rp?.name,
+      hasUser: !!pre.options.user,
+      userId: pre.options.user?.id ? 'present' : 'missing',
+      userIdType: typeof pre.options.user?.id,
+      userName: pre.options.user?.name,
+      userDisplayName: pre.options.user?.displayName,
+      hasPubKeyCredParams: !!pre.options.pubKeyCredParams,
+      pubKeyCredParamsCount: pre.options.pubKeyCredParams?.length,
+      hasAuthenticatorSelection: !!pre.options.authenticatorSelection,
+      timeout: pre.options.timeout,
+      timeoutType: typeof pre.options.timeout,
+      allKeys: Object.keys(pre.options),
+      optionsStringified: JSON.stringify(pre.options).substring(0, 200) + '...'
+    })
+
     console.log('[DEBUG] Calling startRegistration...')
     console.log('[DEBUG] Full options object (will be encoded in QR code for Cross-Device):', JSON.stringify(pre.options, null, 2))
     console.log('[DEBUG] Options summary for startRegistration:', {

server/api/auth/register-passkey-options.post.js

@@ -142,24 +142,21 @@ export default defineEventHandler(async (event) => {
     })
   }
 
-  // Stelle sicher, dass die Options korrekt serialisiert werden
-  const serializedOptions = {
-    ...options,
-    challenge: options.challenge,
-    rp: options.rp,
-    user: options.user,
-    pubKeyCredParams: options.pubKeyCredParams,
-    authenticatorSelection: options.authenticatorSelection,
-    timeout: options.timeout || 300000
-  }
-  
+  // Options direkt zurückgeben (wie in passkeys/registration-options.post.js)
+  // @simplewebauthn/server gibt bereits korrekt formatierte Options zurück
   const totalDuration = Date.now() - requestStart
   console.log(`[DEBUG] Returning options (total: ${totalDuration}ms)`, {
     registrationId,
-    optionsKeys: Object.keys(serializedOptions),
-    serializedChallengeLength: serializedOptions.challenge?.length
+    optionsKeys: Object.keys(options),
+    challengeLength: options.challenge?.length,
+    challengeType: typeof options.challenge,
+    rpId: options.rp?.id,
+    userIdType: typeof options.user?.id,
+    timeout: options.timeout
   })
 
-  return { success: true, registrationId, options: serializedOptions }
+  // WICHTIG: Options direkt zurückgeben, keine manuelle Serialisierung
+  // Die Options von @simplewebauthn/server sind bereits korrekt formatiert
+  return { success: true, registrationId, options }
 })