Refactor signer implementation to use p8k package

- Replaced all instances of p256k1signer with the new p8k.Signer across various modules, including event creation, policy handling, and database interactions.
- Updated related test cases and benchmarks to ensure compatibility with the new signer interface.
- Bumped version to v0.25.0 to reflect these significant changes and improvements in cryptographic operations.

pkg/encoders/event/signatures.go

@@ -4,8 +4,8 @@ import (
 	"lol.mleku.dev/chk"
 	"lol.mleku.dev/errorf"
 	"lol.mleku.dev/log"
-	p256k1signer "p256k1.mleku.dev/signer"
 	"next.orly.dev/pkg/interfaces/signer"
+	"next.orly.dev/pkg/interfaces/signer/p8k"
 	"next.orly.dev/pkg/utils"
 )
 
@@ -26,7 +26,10 @@ func (ev *E) Sign(keys signer.I) (err error) {
 // Verify an event is signed by the pubkey it contains. Uses
 // github.com/bitcoin-core/secp256k1 if available for faster verification.
 func (ev *E) Verify() (valid bool, err error) {
-	keys := p256k1signer.NewP256K1Signer()
+	var keys *p8k.Signer
+	if keys, err = p8k.New(); chk.E(err) {
+		return
+	}
 	if err = keys.InitPub(ev.Pubkey); chk.E(err) {
 		return
 	}