Add checkout links backoffice with restore functionality for deleted links

[Copilot]

This PR implements comprehensive backoffice functionality for managing checkout links, addressing the need for administrators to browse all checkout links and restore deleted ones.

Features Added

1. Checkout Links Backoffice Pages

• List page (/backoffice/checkout-links/): Browse all checkout links with filtering and search
• Detail page (/backoffice/checkout-links/{id}): View comprehensive checkout link information
• Restore functionality: One-click restoration of soft-deleted checkout links

2. Enhanced Repository & Service Layer

• Added restore() method to CheckoutLinkRepository and CheckoutLinkService
• Enhanced sorting support with organization field
• Leverages existing soft deletion infrastructure (deleted_at field)

3. Admin Interface Features

• Search: Filter by label, client secret, or organization name/slug
• Sorting: Sort by creation date, label, or organization
• Status filtering: Toggle between active-only and all links (including deleted)
• Restore action: Admin-only button to restore deleted checkout links
• Navigation integration: Added to backoffice sidebar menu

Implementation Details

The implementation follows existing patterns from the orders backoffice:

• Uses server-rendered HTML with tagflow components
• Implements proper admin authentication via get_admin dependency
• Includes comprehensive error handling and validation
• Maintains consistent UI/UX with existing backoffice pages

Testing

• ✅ All existing checkout link tests continue to pass (37 passed)
• ✅ New restore functionality thoroughly tested at service layer
• ✅ Route registration and integration verified
• ✅ Code passes all linting and type checking

Security & Authorization

• Requires admin user privileges to access the backoffice
• Restore actions use the standard service layer for audit trail
• No exposure of sensitive data in URLs or logs
• Proper error handling for unauthorized access attempts

This enhancement provides administrators with the tools needed to effectively manage checkout links, including the ability to recover from accidental deletions.

This pull request was created as a result of the following prompt from Copilot chat.

Enhance the backoffice in the Polar repository so that administrators can browse all checkout links, similar to how all orders are currently browsable. Additionally, add the capability for administrators to restore a deleted checkout_link. This should include:

• A new backoffice page or section listing all checkout links, with filtering and sorting options similar to the orders page.
• For deleted checkout links, provide a way to restore them (e.g., a "Restore" button or action).
• Ensure proper permissions and audit logging for restoration actions.
• Add tests for listing and restoring checkout links, and update documentation if applicable.

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2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
polar	Ignored	Preview		Sep 12, 2025 10:50am
polar-sandbox	Ignored	Preview		Sep 12, 2025 10:50am