feat: drop outdated session (#14373)

#### PR Dependency Tree


* **PR #14373** 👈

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 client version tracking and validation to ensure application
compatibility across authentication flows and sessions.
* Enhanced OAuth authentication with improved version handling during
sign-in and refresh operations.

* **Bug Fixes**
* Improved payment callback URL handling with safer defaults for
redirect links.

* **Tests**
* Expanded test coverage for client version enforcement and session
management.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/migrations/20260204105925_user_sessions_client_version/migration.sql

@@ -0,0 +1,7 @@
+-- AlterTable
+ALTER TABLE
+    "user_sessions"
+ADD
+    COLUMN "sign_in_client_version" VARCHAR,
+ADD
+    COLUMN "refresh_client_version" VARCHAR;