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/app.module.ts

@@ -55,13 +55,14 @@ import { Env } from './env';
 import { ModelsModule } from './models';
 import { CalendarModule } from './plugins/calendar';
 import { CaptchaModule } from './plugins/captcha';
-import { CopilotModule, CopilotRealtimeModule } from './plugins/copilot';
+import { CopilotModule } from './plugins/copilot';
 import { GCloudModule } from './plugins/gcloud';
 import { IndexerModule } from './plugins/indexer';
 import { LicenseModule } from './plugins/license';
 import { OAuthModule } from './plugins/oauth';
 import { PaymentModule } from './plugins/payment';
 import { WorkerModule } from './plugins/worker';
+import { ServerRealtimeHandlersModule } from './realtime-handlers.module';
 
 export const FunctionalityModules = [
   ClsModule.forRoot({
@@ -188,7 +189,7 @@ export function buildAppModule(env: Env) {
     )
     .useIf(
       () => !env.flavors.graphql && (env.flavors.sync || env.flavors.front),
-      CopilotRealtimeModule
+      ServerRealtimeHandlersModule
     )
     // graphql server only
     .useIf(