[Task]: Local BM25 Search for MCP Keyword Search

### Task Type

Feature

### Task Description

Modify the MCP keyword search tool to create its own BM25 storage when called, insert the nodes in the current connection into its BM25, then search_bm25 with the query. This means that it will no longer need to specify the label for the node and will improve the accuracy of the search.



### Priority

Medium

### Additional Information

_No response_