Feat: add advanced document filter (#8723)

### What problem does this PR solve?

Add advanced document filter

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/db/services/file_service.py

@@ -17,6 +17,7 @@ import logging
 import os
 import re
 from concurrent.futures import ThreadPoolExecutor
+from pathlib import Path
 
 from flask_login import current_user
 from peewee import fn
@@ -446,6 +447,7 @@ class FileService(CommonService):
                     "created_by": user_id,
                     "type": filetype,
                     "name": filename,
+                    "suffix": Path(filename).suffix.lstrip("."),
                     "location": location,
                     "size": len(blob),
                     "thumbnail": thumbnail_location,