chore(server): improve semantic search (#12838)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Updated document-related tools in chat prompts, including new options
for document keyword and semantic search.

- **Refactor**
- Renamed and reorganized document search tools for improved clarity in
tool selection and results display.

- **Bug Fixes**
- Ensured tool identifiers and results are consistent across chat and
search features.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/prompt/prompts.ts

@@ -1792,11 +1792,11 @@ Below is the user's query. Please respond in the user's preferred language witho
   ],
   config: {
     tools: [
-      'readDoc',
-      'editDoc',
+      'docRead',
+      'docEdit',
+      'docKeywordSearch',
+      'docSemanticSearch',
       'webSearch',
-      'keywordSearch',
-      'semanticSearch',
     ],
   },
 };