Divine Bolts as modified by Power Of Skill:
You can use any power you have that is associated with this feat as a basic attack.
Is treated as a basic attack, and because it's ranged, is treated as a ranged basic attack.
The paragon feat: Staff of Channeled Invocations:
Benefit: When you use any ranged invoker attack power through a staff, you can use the power as a melee attack with a range of 1.
Does this channeled divine bolts then count as a melee basic attack?