Fix: save Kling Motion video to settings.paths.output_dir (matches serve endpoint)

src/content_engine/api/routes_video.py

@@ -381,7 +381,8 @@ async def _generate_kling_motion_video(
 
         # Download and save
         _video_jobs[job_id]["message"] = "Downloading video..."
-        output_dir = Path(os.environ.get("OUTPUT_DIR", "outputs")) / "videos"
+        from content_engine.config import settings
+        output_dir = settings.paths.output_dir / "videos"
         output_dir.mkdir(parents=True, exist_ok=True)
         filename = f"kling_motion_{job_id}.mp4"
         output_path = output_dir / filename