fix(server): realtime handler (#15146)

#### PR Dependency Tree


* **PR #15146** 👈

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

## Release Notes

* **Refactor**
* Reworked real-time backend wiring to centralize workspace, comments,
and Copilot embedding handlers under a unified server setup.
* Updated Copilot embedding real-time handling to use context
configuration when publishing updates.
* **New Features**
* Added automatic startup validation to ensure all required real-time
request/topic handlers are registered (for applicable server flavors).
* **Bug Fixes**
* Workspace real-time access now determines team status from quota
state.
* Improved Copilot embedding progress publishing (including completion
events).
* **Tests**
* Expanded real-time registry completeness and Copilot embedding
provider coverage.
  * Added quota-state restoration coverage after clearing stale expiry.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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

@@ -14,6 +14,7 @@ import { CopilotController } from './controller';
 import { WorkspaceMcpController } from './mcp/controller';
 import {
   COPILOT_API_PROVIDERS,
+  COPILOT_CONTEXT_REALTIME_PROVIDERS,
   COPILOT_FEATURE_PROVIDERS,
   COPILOT_KERNEL_PROVIDERS,
   COPILOT_TRANSCRIPT_REALTIME_PROVIDERS,
@@ -43,6 +44,12 @@ export class CopilotKernelModule {}
 })
 export class CopilotRealtimeModule {}
 
+@Module({
+  imports: [PermissionModule],
+  providers: [...COPILOT_CONTEXT_REALTIME_PROVIDERS],
+})
+export class CopilotEmbeddingRealtimeModule {}
+
 @Module({
   imports: [...COPILOT_SHARED_IMPORTS, CopilotKernelModule],
   providers: [...COPILOT_FEATURE_PROVIDERS],