chore: audit(2026-05) phase 2a slice 12: extract licensing concern

[ooples]

Stacked on #1435. Extracts ConfigureLicenseKey into internal IAiModelLicensing (internal because LicenseValidator is internal). Both ctors initialise the component with their optional licenseKey; ConfigureLicenseKey resets the cached validator on key change (preserves pre-refactor side-effect verbatim). 5/5 tests pass, both TFMs clean.

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Project	Deployment	Actions	Updated (UTC)
aidotnet_website	Ready	Preview, Comment	May 23, 2026 4:05am

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🤖 PR Title Auto-Fixed

Your PR title was automatically updated to follow Conventional Commits format.

Original title:
audit(2026-05) phase 2a slice 12: extract licensing concern

New title:
chore: audit(2026-05) phase 2a slice 12: extract licensing concern

Detected type: chore: (default type)
Version impact: No release

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