Shor algorithm and schnorr signature in ed25519 Does the application of Shor's algorithm in any way relate/affect the schnorr signature in ed25519?
Shor's algorithm can compute discrete logs in elliptic curves and thereby recover the secret scalar from a public Ed25519 key, which you can use to forge signatures of your choice.

So, yes, it affects Ed25519—it completely breaks Ed25519, or it would if you could engineer a quantum computer capable of executing it.

It can also compute discrete logs in finite fields, which you can use to forge traditional finite-field Schnorr signatures.