Add license key rotation and hide licenses for users without any

[simonhamp]

Summary

• Add a "Rotate Key" button on the license detail page (/dashboard/licenses/{key}) that creates a new Anystack license, updates the local record in place, and suspends the old Anystack license
• Follows the same UI pattern as the existing plugin access key rotation (modal with confirmation + warnings)
• Button is hidden for suspended/expired licenses
• Hide the Licenses sidebar nav item and dashboard card for users who have no licenses (since licenses are no longer sold)

Test plan

• RotateLicenseKeyTest — action creates new Anystack license, suspends old, updates local record, preserves attributes, handles API failure
• CustomerLicenseManagementTest — Livewire rotation happy path, blocked for suspended/expired, rotate button visibility, dashboard card hidden when no licenses

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