fix(server): exclude outdated doc id style in embedding count (#13269)

fix AI-392
fix AI-393

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

## Summary by CodeRabbit

* **New Features**
* Improved filtering of outdated document ID styles in embedding status
reporting, ensuring more accurate counts of embedded documents.
* Stricter rate limiting applied to workspace embedding status queries
for enhanced system reliability.

* **Bug Fixes**
* Resolved issues with duplicate or outdated document IDs affecting
embedding status totals.

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

packages/backend/server/src/plugins/copilot/context/resolver.ts

@@ -356,6 +356,7 @@ export class CopilotContextRootResolver {
     return false;
   }
 
+  @Throttle('strict')
   @Query(() => ContextWorkspaceEmbeddingStatus, {
     description: 'query workspace embedding status',
   })
@@ -372,9 +373,7 @@ export class CopilotContextRootResolver {
 
     if (this.context.canEmbedding) {
       const { total, embedded } =
-        await this.models.copilotWorkspace.getWorkspaceEmbeddingStatus(
-          workspaceId
-        );
+        await this.models.copilotWorkspace.getEmbeddingStatus(workspaceId);
       return { total, embedded };
     }