feat(server): entitlement based model (#14996)

#### PR Dependency Tree


* **PR #14996** 👈

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

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## Summary by CodeRabbit

* **New Features**
  * Admin mutations to grant/revoke commercial entitlements.
  * New Doc comment-update permission.
  * Realtime user/workspace quota-state endpoints and live-update rooms.

* **Bug Fixes**
  * More accurate readable-doc filtering and permission evaluation.

* **Refactor**
* Workspace feature management moved to entitlement-based model;
permission and quota pipelines redesigned.
  * Admin workspace UI now edits flags only (feature toggles removed).

* **Tests**
* Extensive new and updated tests for permissions, entitlements, quota,
projection, and backfills.

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

@@ -28,7 +28,7 @@ import {
   TooManyRequest,
 } from '../../base';
 import { CurrentUser } from '../../core/auth';
-import { AccessController, DocAction } from '../../core/permission';
+import { DocAction, PermissionAccess } from '../../core/permission';
 import { UserType } from '../../core/user';
 import type { ListSessionOptions, UpdateChatSession } from '../../models';
 import { CompatHistoryProjector } from './compat/history-projector';
@@ -365,7 +365,7 @@ export class CopilotResolver {
   private readonly modelNames = new Map<string, string>();
 
   constructor(
-    private readonly ac: AccessController,
+    private readonly ac: PermissionAccess,
     private readonly mutex: RequestMutex,
     private readonly prompt: PromptService,
     private readonly chatSession: ChatSessionService,
@@ -815,7 +815,7 @@ export class CopilotResolver {
 @Throttle()
 @Resolver(() => UserType)
 export class UserCopilotResolver {
-  constructor(private readonly ac: AccessController) {}
+  constructor(private readonly ac: PermissionAccess) {}
 
   @ResolveField(() => CopilotType)
   async copilot(