feat(server): entitlement primitive (#14964)

#### PR Dependency Tree


* **PR #14964** 👈

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

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## Summary by CodeRabbit

* **New Features**
* Added entitlement resolution to validate licenses and derive plan,
quotas, expiry and flags.
* Introduced persistent quota/entitlement state for users and workspaces
with legacy sync behavior.
* Real-time quota-state operations and change events for monitoring
usage.

* **Chores**
  * Updated workspace dependencies to add cryptography/hash crates.

* **Tests**
* Added native entitlement tests covering validation, quantity handling,
and signature/expiry cases.

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packages/backend/native/src/lib.rs

@@ -4,6 +4,7 @@ mod utils;
 
 pub mod doc;
 pub mod doc_loader;
+pub mod entitlement;
 pub mod file_type;
 pub mod hashcash;
 pub mod html_sanitize;