meanwhile, the death star took like generations of theorizing and development by like the smartest guy they could find, a completely unique and entire planet's worth of extremely rare, ancient magic materials, and multiple planets of slave labor to make a single doomsday weapon.

And they built another one, more than twice as large, very shortly afterwards. And another bigger and more powerful one after that.
Star Wars has tons of planet killing super weapons knocking around, some of which can work from tens of thousands of lightyears away.

but the federation of Star Trek just plain has superior technology by several orders of magnitude

It does more stuff sure, but Star Wars has provided numbers for lots of their ships, weapons and various technologies, and the numbers are far in excess of early-to-mid era star trek. Terrible numbers mind, with seemingly no thought for consistency, but they are canon.

A single star destroyer is enough to liquify the crust of a planet in fairly short order.