Fix start training job

services/training/app/api/training.py

@@ -95,7 +95,14 @@ async def start_training_job(
                    job_id=job.job_id,
                    tenant_id=tenant_id)
 
-        return job
+        return TrainingJobResponse(
+            job_id=job.job_id,
+            status=TrainingStatus.PENDING,
+            message="Training job created successfully",
+            tenant_id=tenant_id,
+            created_at=job.created_at,
+            estimated_duration_minutes=30
+)
 
     except Exception as e:
         logger.error("Failed to start training job",