Integrate multi-currency debt visibility across the platform by adding
support for foreign currency credits in the user profile shortcode,
improving the admin dashboard with unsettled credits widgets, and
enhancing the Filament admin panel with navigation badges and relation
managers.
- Add multi-currency debt table to WordPress user profile shortcode
- Implement `UnsettledCreditsWidget` for Filament dashboard
- Add navigation badge to `CustomerCreditResource` for open credits
- Add `CreditsRelationManager` to `UserResource`
- Update `CustomerOrderController` API to include `foreign_credits`
- Add concurrency check in `CustomerCreditService` during settlement
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