Add NPC creation status tracking and progress reporting in Admin module

- Implemented getNPCsCreationStatus method in AdminController to retrieve the status of NPC creation jobs.
- Enhanced AdminService to manage NPC creation jobs, including job ID generation, progress updates, and error handling.
- Updated frontend CreateNPCView to display progress of NPC creation, including estimated time remaining and job status.
- Added localization strings for progress reporting in both German and English.
- Improved overall user experience by providing real-time feedback during NPC creation processes.

frontend/src/components/AppContent.vue

@@ -1,6 +1,8 @@
 <template>
-    <main>
-      <router-view></router-view>
+    <main class="contenthidden">
+      <div class="contentscroll">
+        <router-view></router-view>
+      </div>
     </main>
   </template>
   
@@ -12,9 +14,13 @@
   
   <style scoped>
   main {
-    padding: 20px;
+    padding: 0;
     background-color: #ffffff;
     flex: 1;
   }
+  
+  .contentscroll {
+    padding: 20px;
+  }
   </style>