feat(server): add doc keyword search tool (#12837)

close AI-185

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

- **New Features**
- Introduced a keyword-based document search tool, allowing users to
search for relevant documents within their workspace using keywords.
- Search results include document titles, summaries, and direct links,
enhancing document discovery and navigation.
- **Bug Fixes**
  - None.
- **Tests**
- Added new tests to verify document search by IDs and by keywords,
ensuring accurate and reliable search functionality.
- **Documentation**
  - None.
- **Chores**
- Updated configuration file organization for improved clarity; no
changes to functionality.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->








#### PR Dependency Tree


* **PR #12867**
  * **PR #12863**
    * **PR #12837** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

packages/backend/server/src/plugins/copilot/providers/provider.ts

@@ -10,9 +10,12 @@ import {
   OnEvent,
 } from '../../../base';
 import { AccessController } from '../../../core/permission';
+import { IndexerService } from '../../indexer';
 import { CopilotContextService } from '../context';
 import {
+  buildDocKeywordSearchGetter,
   buildDocSearchGetter,
+  createDocKeywordSearchTool,
   createDocSemanticSearchTool,
   createExaCrawlTool,
   createExaSearchTool,
@@ -125,6 +128,7 @@ export abstract class CopilotProvider<C = any> {
   ): Promise<ToolSet> {
     const tools: ToolSet = {};
     if (options?.tools?.length) {
+      this.logger.debug(`getTools: ${JSON.stringify(options.tools)}`);
       for (const tool of options.tools) {
         const toolDef = this.getProviderSpecificTools(tool, model);
         if (toolDef) {
@@ -143,6 +147,24 @@ export abstract class CopilotProvider<C = any> {
             );
             break;
           }
+          case 'docKeywordSearch': {
+            if (this.AFFiNEConfig.indexer.enabled) {
+              const ac = this.moduleRef.get(AccessController, {
+                strict: false,
+              });
+              const indexerService = this.moduleRef.get(IndexerService, {
+                strict: false,
+              });
+              const searchDocs = buildDocKeywordSearchGetter(
+                ac,
+                indexerService
+              );
+              tools.doc_keyword_search = createDocKeywordSearchTool(
+                searchDocs.bind(null, options)
+              );
+            }
+            break;
+          }
           case 'webSearch': {
             tools.web_search_exa = createExaSearchTool(this.AFFiNEConfig);
             tools.web_crawl_exa = createExaCrawlTool(this.AFFiNEConfig);