feat(server): improve context management (#15448)

#### PR Dependency Tree


* **PR #15448** 👈

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

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

* **New Features**
* Added workspace artifact upload, browsing, removal, deduplication, and
library ownership support.
* Copilot now supports scoped document and artifact search, canvas
reading, live editor context, and frontend tools.
* Added scope and focus selectors with source-resolution receipts in
chat.
* Added embedding health, progress, synchronization, and retrieval
capabilities.
* Added BYOK policy visibility, provider restrictions, endpoint dialect
selection, and validation.
* Added delegated editor interactions and userdata document
authorization.

* **Bug Fixes**
* Improved attachment handling, cancellation, access control, retrieval
fallbacks, workspace synchronization, and configuration validation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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

@@ -17,7 +17,6 @@ import { McpCredentialService } from './mcp/credential';
 import { McpCredentialResolver } from './mcp/resolver';
 import {
   COPILOT_API_PROVIDERS,
-  COPILOT_CONTEXT_REALTIME_PROVIDERS,
   COPILOT_FEATURE_PROVIDERS,
   COPILOT_KERNEL_PROVIDERS,
   COPILOT_TRANSCRIPT_REALTIME_PROVIDERS,
@@ -49,17 +48,11 @@ export class CopilotAvailabilityModule {}
 export class CopilotKernelModule {}
 
 @Module({
-  imports: [PermissionModule, CopilotAvailabilityModule],
+  imports: [PermissionModule, CopilotAvailabilityModule, CopilotKernelModule],
   providers: [...COPILOT_TRANSCRIPT_REALTIME_PROVIDERS],
 })
 export class CopilotRealtimeModule {}
 
-@Module({
-  imports: [PermissionModule, CopilotAvailabilityModule],
-  providers: [...COPILOT_CONTEXT_REALTIME_PROVIDERS],
-})
-export class CopilotEmbeddingRealtimeModule {}
-
 @Module({
   imports: [...COPILOT_SHARED_IMPORTS, CopilotKernelModule],
   providers: [...COPILOT_FEATURE_PROVIDERS],