Fix duplicate license expiry handling

[Teichoui]

Fixes a Live sync bug where duplicate license rows for the same plugin could cause a valid resource to be blocked as license_expired.

What changed

• treat a resource as licensed if any active license row for that resource is still valid or unlimited
• keep license_expired only when all active license rows for that resource are expired
• prefer payload data from a valid license row when duplicate rows exist
• add regression coverage for the duplicate-license case from issue not downloading all plugins. #21

Verification

• Automated: 58 passed on the local Python 3.12 test suite
• Manual: verified on a LIVE account with duplicate MQ2Shaman license rows (expired + current) by deleting the local plugin and running a normal bulk update
• Result: MQ2Shaman.zip (ID: 1724) downloaded successfully during the update flow

Closes #21