Add: remove tmp video thumb file after import & update tmp work path

backend/apps/files/tasks.py

@@ -85,7 +85,7 @@ def generate_video_thumbnail(
             video_path = pstfile.file.path
 
             # Create output directory if it doesn't exist
-            output_dir = os.path.join("/tmp/thumbgen/", str(file_id))
+            output_dir = "/tmp/thumbgen/"
             os.makedirs(output_dir, exist_ok=True)
 
             thumbnail_filename = f"thumbnail_{pstfile.hash_blake3}.png"
@@ -127,6 +127,8 @@ def generate_video_thumbnail(
 
             pstfile.save()
 
+            os.remove(thumbnail_file_path)
+
         return f"Thumbnail generated and saved to {thumbnail_file_path}"
 
     except subprocess.CalledProcessError as e: