Fix some issues in API (#2982)

### What problem does this PR solve?

Fix some issues in API

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>

sdk/python/ragflow/modules/session.py

@@ -40,7 +40,7 @@ class Session(Base):
                                 "content": chunk["content_with_weight"],
                                 "document_id": chunk["doc_id"],
                                 "document_name": chunk["docnm_kwd"],
-                                "knowledgebase_id": chunk["kb_id"],
+                                "dataset_id": chunk["kb_id"],
                                 "image_id": chunk["img_id"],
                                 "similarity": chunk["similarity"],
                                 "vector_similarity": chunk["vector_similarity"],
@@ -75,7 +75,7 @@ class Chunk(Base):
         self.content = None
         self.document_id = ""
         self.document_name = ""
-        self.knowledgebase_id = ""
+        self.dataset_id = ""
         self.image_id = ""
         self.similarity = None
         self.vector_similarity = None