feat(server): converge legacy compatibility (#15426)

#### PR Dependency Tree


* **PR #15426** 👈

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

* **New Features**
* Added workspace BYOK profiles with provider/model catalogs, capability
validation, connection probing, credential rotation, reordering, and
secure local leases.
* Added Copilot route options, selectable targets, managed tiers,
explicit profile/model overrides, and improved streaming with tool
callbacks and abort support.
* Added Copilot availability controls to prevent access when the feature
is disabled.
* **Changes**
* Simplified Copilot configuration and removed legacy provider-specific
settings.
* Removed obsolete model, token-cost, transcript strategy, and provider
metadata fields from public responses.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/native/src/runtime/mod.rs

@@ -6,5 +6,5 @@ pub(crate) mod error;
 pub(crate) mod migrations;
 pub(crate) mod types;
 
-pub(crate) use config::{BackendRuntimeConfig, InviteQuotaConfig};
+pub(crate) use config::{BackendRuntimeConfig, CopilotManagedProfileConfig, CopilotRuntimeConfig, InviteQuotaConfig};
 pub(crate) use error::{RuntimeError, RuntimeResult, napi_error, to_napi_error};