Supports cannot add tags to gems. They can add to or change the behaviour of the skill, in a way that affects which other supports can apply, but that has nothing to do with tags. Tags are not used for supportability.

Swift Afliction says on the gem "Supports any skill that has a duration, or can hit enemies to inflict ailments on them". Fireball does not have a duration, but can hit enemies to inflict ailments, so Swift Afliction can support it.

Less Duration says "Supports any skill that has a duration", and since Fireball does not have any duration, it cannot support Fireball.

Swift Afliction only changes Fireball's behaviour by affecting the ailments in inflicts, it does not add a component to the skill with a duration, so it does not cause supports such as Less Duration to be able to apply.
No. None of that behaviour involves tags.

Arcane Surge modifies the behaviour of the supported skill such that it now applies a buff with an explicit duration. That means the skill now has a component with a duration, and thus can be modified by supports that care about that.

Tags are a property of gems, not skills. They are not involved at all in working out what supports what. They are used to identify classes of gems.

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