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/tools/doc-semantic-search.ts

@@ -20,12 +20,21 @@ export const buildDocSearchGetter = (
       .can('Workspace.Read');
     if (!canAccess) return undefined;
     const chunks = await context.matchWorkspaceAll(options.workspace, query);
-    return chunks || undefined;
+    const docChunks = await ac
+      .user(options.user)
+      .workspace(options.workspace)
+      .docs(
+        chunks.filter(c => 'docId' in c),
+        'Doc.Read'
+      );
+    const fileChunks = chunks.filter(c => 'fileId' in c);
+    if (!docChunks.length && !fileChunks.length) return undefined;
+    return [...fileChunks, ...docChunks];
   };
   return searchDocs;
 };
 
-export const createSemanticSearchTool = (
+export const createDocSemanticSearchTool = (
   searchDocs: (query: string) => Promise<ChunkSimilarity[] | undefined>
 ) => {
   return tool({

packages/backend/server/src/plugins/copilot/tools/index.ts

@@ -1,2 +1,2 @@
-export * from './semantic-search';
+export * from './doc-semantic-search';
 export * from './web-search';