Feat: When Delete Chunk Will Also Delete Chunk Related Image (#7656)

### What problem does this PR solve?

When Delete Chunk Will Also Delete Chunk Related Image

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

api/apps/chunk_app.py

 import re
 
 
+
 @manager.route('/list', methods=['POST'])  # noqa: F821
 @login_required
 @validate_request("doc_id")
 @login_required
 @validate_request("chunk_ids", "doc_id")
 def rm():
+    from rag.utils.storage_factory import STORAGE_IMPL
     req = request.json
     try:
         e, doc = DocumentService.get_by_id(req["doc_id"])
         deleted_chunk_ids = req["chunk_ids"]
         chunk_number = len(deleted_chunk_ids)
         DocumentService.decrement_chunk_num(doc.id, doc.kb_id, 1, chunk_number, 0)
+        for cid in deleted_chunk_ids:
+            if STORAGE_IMPL.obj_exist(doc.kb_id, cid):
+                STORAGE_IMPL.rm(doc.kb_id, cid)
         return get_json_result(data=True)
     except Exception as e:
         return server_error_response(e)