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/frontend/admin/src/config.json

@@ -171,6 +171,18 @@
       "desc": "The minimum time interval in milliseconds of creating a new history snapshot when doc get updated."
     }
   },
+  "permission": {
+    "readModel": {
+      "type": "String",
+      "desc": "Permission data source for Rust evaluation",
+      "env": "AFFINE_PERMISSION_READ_MODEL"
+    },
+    "fallbackLegacyLoader": {
+      "type": "Boolean",
+      "desc": "Fallback from projection loader to legacy loader when projection input loading fails",
+      "env": "AFFINE_PERMISSION_FALLBACK_LEGACY_LOADER"
+    }
+  },
   "storages": {
     "avatar.publicPath": {
       "type": "String",