Enhance deployment script with PM2 process checks and error handling

Update deploy-production.sh to include checks for PM2 installation and process existence before restarting. Implement error messages for failed starts and restarts, improving robustness and user guidance during deployment. Additionally, add useful commands for managing the PM2 process post-deployment.

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

@@ -20,19 +20,18 @@ export default defineEventHandler(async (event) => {
   })
 
   // CORS-Header für Cross-Device Authentication
+  // OPTIONS-Requests werden von .options.js behandelt
   const allowedOrigin = requestOrigin || webauthnOrigin
   if (allowedOrigin) {
     setHeader(event, 'Access-Control-Allow-Origin', allowedOrigin)
     setHeader(event, 'Access-Control-Allow-Credentials', 'true')
     setHeader(event, 'Access-Control-Allow-Methods', 'POST, OPTIONS')
     setHeader(event, 'Access-Control-Allow-Headers', 'Content-Type, Authorization, Origin, X-Requested-With')
-  }
-
-  // OPTIONS Preflight-Request
-  if (getMethod(event) === 'OPTIONS') {
-    console.log('[DEBUG] OPTIONS preflight request, returning 204')
-    setResponseStatus(event, 204)
-    return null
+    console.log('[DEBUG] CORS headers set for POST', { 
+      origin: allowedOrigin,
+      requestOrigin,
+      webauthnOrigin
+    })
   }
 
   const body = await readBody(event)