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.

backend/services/npcCreationJobService.js

@@ -0,0 +1,86 @@
+// In-Memory Job-Status-Service für NPC-Erstellung
+// Für Produktion sollte man Redis oder eine Datenbank verwenden
+
+const jobs = new Map();
+
+class NPCCreationJobService {
+    createJob(userId, jobId) {
+        jobs.set(jobId, {
+            userId,
+            status: 'pending',
+            progress: 0,
+            total: 0,
+            current: 0,
+            startTime: Date.now(),
+            estimatedTimeRemaining: null,
+            error: null,
+            result: null
+        });
+        return jobId;
+    }
+
+    getJob(jobId) {
+        return jobs.get(jobId);
+    }
+
+    updateProgress(jobId, current, total) {
+        const job = jobs.get(jobId);
+        if (!job) return;
+
+        job.current = current;
+        job.total = total;
+        job.progress = total > 0 ? Math.round((current / total) * 100) : 0;
+
+        // Berechne verbleibende Zeit basierend auf bisheriger Geschwindigkeit
+        if (current > 0 && job.progress < 100) {
+            const elapsed = Date.now() - job.startTime;
+            const avgTimePerItem = elapsed / current;
+            const remaining = total - current;
+            job.estimatedTimeRemaining = Math.round(remaining * avgTimePerItem);
+        }
+    }
+
+    setStatus(jobId, status) {
+        const job = jobs.get(jobId);
+        if (!job) return;
+        job.status = status;
+    }
+
+    setError(jobId, error) {
+        const job = jobs.get(jobId);
+        if (!job) return;
+        job.status = 'error';
+        job.error = error;
+    }
+
+    setResult(jobId, result) {
+        const job = jobs.get(jobId);
+        if (!job) return;
+        job.status = 'completed';
+        job.result = result;
+        job.progress = 100;
+        job.estimatedTimeRemaining = 0;
+    }
+
+    deleteJob(jobId) {
+        jobs.delete(jobId);
+    }
+
+    // Cleanup alte Jobs (älter als 1 Stunde)
+    cleanupOldJobs() {
+        const oneHourAgo = Date.now() - (60 * 60 * 1000);
+        for (const [jobId, job] of jobs.entries()) {
+            if (job.startTime < oneHourAgo) {
+                jobs.delete(jobId);
+            }
+        }
+    }
+}
+
+// Cleanup alle 10 Minuten
+setInterval(() => {
+    const service = new NPCCreationJobService();
+    service.cleanupOldJobs();
+}, 10 * 60 * 1000);
+
+export default new NPCCreationJobService();