Sentra 2008 MR20 engine no longer turns on the engine

Cylinder 1 has 156 PSI of compression; in the others, the compression gauge needle does not rise

That's strange, but it didn't suffer any choke or anything like that.
Did you try adding oil to all three cylinders? That should increase the compression.
It's odd that if you don't have compression, the valves are bent. That's happened to me when the vehicle suffers a slightly hard choke.

No, it wasn't in any accident. I checked by pouring gasoline into the exhaust and intake ports when the engine was upside down, and I saw that gasoline was leaking out quickly through the valves. But at the machine shop, they told me that the valve seats and valves were somewhat pitted and weren't sealing properly

Did you remove the cylinder head?
Does it have adjustable tappets or nuts?

ADJUSTABLE COINS