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

#### PR Dependency Tree


* **PR #14996** 👈

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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/models/base.ts

@@ -19,4 +19,13 @@ export class BaseModel {
     // See https://papooch.github.io/nestjs-cls/plugins/available-plugins/transactional#using-the-injecttransaction-decorator
     return this.txHost.tx;
   }
+
+  protected async withPermissionProjectionMetric<T>(operation: Promise<T>) {
+    try {
+      return await operation;
+    } catch (err) {
+      this.models.permissionProjection.recordTriggerErrorMetric(err);
+      throw err;
+    }
+  }
 }