Adds end-to-end reading and saving of API Permissions role permissions.

[Link2Twenty]

• Persist the permissions selected in the admin role form on create and update. The backend extracts enabled actions from collection types, single types, plugins, and settings, then reuses or creates permission records and synchronizes the role relationship.
• Populate the edit form from the role's saved permission records so selected actions remain checked when reopening a role.
• Keep permission updates clean by removing orphaned permission records after a role is resaved.
• Update role-list navigation to use React Router, add an in-app delete confirmation dialog, and improve locale-aware search, sorting, and empty states.
• Add react-router-dom as a direct admin dependency and update the lockfile.
• Extend the Playwright role tests to confirm selected permissions are saved and restored, and to cover the updated button/dialog interactions.

[boazpoolman]

LGTM!