Refactor crypto package to use p256k1 signer

- Replaced the p256k package with p256k1.mleku.dev/signer across the codebase, updating all instances where the previous signer was utilized.
- Removed the deprecated p256k package, including all related files and tests, to streamline the codebase and improve maintainability.
- Updated various components, including event handling, database interactions, and protocol implementations, to ensure compatibility with the new signer interface.
- Enhanced tests to validate the new signing functionality and ensure robustness across the application.
- Bumped version to v0.23.3 to reflect these changes.

pkg/encoders/event/benchmark_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"next.orly.dev/pkg/crypto/p256k"
+	p256k1signer "p256k1.mleku.dev/signer"
 	"next.orly.dev/pkg/encoders/hex"
 	"next.orly.dev/pkg/encoders/kind"
 	"next.orly.dev/pkg/encoders/tag"
@@ -14,7 +14,7 @@ import (
 
 // createTestEvent creates a realistic test event with proper signing
 func createTestEvent() *E {
-	signer := &p256k.Signer{}
+	signer := p256k1signer.NewP256K1Signer()
 	if err := signer.Generate(); err != nil {
 		panic(err)
 	}
@@ -44,7 +44,7 @@ func createTestEvent() *E {
 
 // createLargeTestEvent creates a larger event with more tags and content
 func createLargeTestEvent() *E {
-	signer := &p256k.Signer{}
+	signer := p256k1signer.NewP256K1Signer()
 	if err := signer.Generate(); err != nil {
 		panic(err)
 	}

pkg/encoders/event/signatures.go

@@ -4,7 +4,7 @@ import (
 	"lol.mleku.dev/chk"
 	"lol.mleku.dev/errorf"
 	"lol.mleku.dev/log"
-	"next.orly.dev/pkg/crypto/p256k"
+	p256k1signer "p256k1.mleku.dev/signer"
 	"next.orly.dev/pkg/interfaces/signer"
 	"next.orly.dev/pkg/utils"
 )
@@ -26,7 +26,7 @@ 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 := p256k.Signer{}
+	keys := p256k1signer.NewP256K1Signer()
 	if err = keys.InitPub(ev.Pubkey); chk.E(err) {
 		return
 	}