add /dates GET /dates - release and upgrade-enabled dates for every…

+ add /dates
GET /dates - release and upgrade-enabled dates for every gift, unix seconds (UTC), oldest release first

~ add releasedAt, releasedAtSource, upgradableAt, upgradableAtSource, upgradable fields
GET /gift/:gift - detailed info about a certain gift


Added gift release dates, along with the dates on which upgrades got released for the specified gifts.
NOTE: some gifts (especially the first unlimited ones) have their release dates set to arbitrary Oct 5, 2024, 9:00 AM UTC+0.
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August 18, 2026 1.7K