Refactor authentication middleware to remove dependency on Pinia, implementing direct API calls for authentication status checks. Update member API documentation to escape JWT token placeholder for clarity. Update session and user data formats for improved security and consistency.

pages/mitgliederbereich/api.vue

@@ -540,7 +540,7 @@ curl -X POST http://localhost:3100/api/auth/login \
 
 # Mitglied hinzufügen mit Token
 curl -X POST http://localhost:3100/api/members \
-  -H "Authorization: Bearer <your-jwt-token>" \
+  -H "Authorization: Bearer &lt;your-jwt-token&gt;" \
   -H "Content-Type: application/json" \
   -d '{
     "firstName": "Max",
@@ -552,7 +552,7 @@ curl -X POST http://localhost:3100/api/members \
 
 # Bulk-Import von Mitgliedern
 curl -X POST http://localhost:3100/api/members/bulk \
-  -H "Authorization: Bearer <your-jwt-token>" \
+  -H "Authorization: Bearer &lt;your-jwt-token&gt;" \
   -H "Content-Type: application/json" \
   -d '{
     "members": [