Simplify customer license UI for expired licenses

[simonhamp]

Summary

Cleans up the customer license dashboard by removing status/expiry "noise", particularly for expired licenses, and removes the sub-key creation button (functionality is kept in place).

Changes

• Expired license banners removed — dropped the "License Expired" warning banner on the individual license screen and the "Keys cannot be created for expired licenses" notice in the sub-license manager. Suspended-license messaging is retained.
• Hide sub-key limit when expired — the key count no longer shows the plan limit (e.g. x/9) once a license has expired. Added an isExpired() helper on License.
• Removed Status column & Expires detail — from both the licenses index (main + assigned sub-licenses tables) and the individual license screen. The shared status-badge component is untouched as it's used elsewhere.
• Removed the "Create Key" button — the create modal and openCreateModal/createSubLicense methods remain, so the flow still works; there's just no UI entry point.

Test plan

• Updated CustomerLicenseManagementTest and CustomerSubLicenseManagementTest to reflect the removed UI; full license/sub-license suites pass.
• Verify an expired license shows no expired banners and no key limit.
• Verify a suspended license still shows its suspended messaging.
• Verify the licenses index and detail screens no longer show Status/Expires.

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