fix(server): query workspace embed files (#11982)

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

- **New Features**
	- Expanded file chunk matching to include both context and workspace file embeddings, providing broader and more relevant search results.
- **Improvements**
	- Enhanced result ranking by introducing a re-ranking step for combined embedding matches, improving the relevance of returned file chunks.
	- Adjusted file count reporting to reflect the total number of workspace files instead of ignored documents for more accurate workspace file statistics.
	- Renamed and streamlined workspace file management methods for clearer and more consistent API usage.
- **Bug Fixes**
	- Prevented embedding similarity queries when embedding is disabled for a workspace, improving system behavior consistency.
- **Tests**
	- Added comprehensive tests to verify workspace embedding management, including enabling, matching, and disabling embedding functionality.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/__tests__/models/copilot-context.spec.ts

@@ -96,20 +96,16 @@ test('should insert embedding by doc id', async t => {
   const { id: contextId } = await t.context.copilotContext.create(session.id);
 
   {
-    await t.context.copilotContext.insertContentEmbedding(
-      contextId,
-      'file-id',
-      [
-        {
-          index: 0,
-          content: 'content',
-          embedding: Array.from({ length: 1024 }, () => 1),
-        },
-      ]
-    );
+    await t.context.copilotContext.insertFileEmbedding(contextId, 'file-id', [
+      {
+        index: 0,
+        content: 'content',
+        embedding: Array.from({ length: 1024 }, () => 1),
+      },
+    ]);
 
     {
-      const ret = await t.context.copilotContext.matchContentEmbedding(
+      const ret = await t.context.copilotContext.matchFileEmbedding(
         Array.from({ length: 1024 }, () => 0.9),
         contextId,
         1,
@@ -121,7 +117,7 @@ test('should insert embedding by doc id', async t => {
 
     {
       await t.context.copilotContext.deleteEmbedding(contextId, 'file-id');
-      const ret = await t.context.copilotContext.matchContentEmbedding(
+      const ret = await t.context.copilotContext.matchFileEmbedding(
         Array.from({ length: 1024 }, () => 0.9),
         contextId,
         1,

packages/backend/server/src/__tests__/models/copilot-workspace.spec.ts

@@ -110,16 +110,20 @@ test('should insert and search embedding', async t => {
       mimeType: 'text/plain',
       size: 1,
     });
-    await t.context.copilotWorkspace.addFileEmbeddings(workspace.id, fileId, [
-      {
-        index: 0,
-        content: 'content',
-        embedding: Array.from({ length: 1024 }, () => 1),
-      },
-    ]);
+    await t.context.copilotWorkspace.insertFileEmbeddings(
+      workspace.id,
+      fileId,
+      [
+        {
+          index: 0,
+          content: 'content',
+          embedding: Array.from({ length: 1024 }, () => 1),
+        },
+      ]
+    );
 
     {
-      const ret = await t.context.copilotWorkspace.matchWorkspaceFileEmbedding(
+      const ret = await t.context.copilotWorkspace.matchFileEmbedding(
         workspace.id,
         Array.from({ length: 1024 }, () => 0.9),
         1,