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/crypto/encryption/benchmark_test.go

@@ -3,7 +3,7 @@ package encryption
 import (
 	"testing"
 
-	"next.orly.dev/pkg/crypto/p256k"
+	p256k1signer "p256k1.mleku.dev/signer"
 	"lukechampine.com/frand"
 )
 
@@ -13,8 +13,8 @@ func createTestConversationKey() []byte {
 }
 
 // createTestKeyPair creates a key pair for ECDH testing
-func createTestKeyPair() (*p256k.Signer, []byte) {
-	signer := &p256k.Signer{}
+func createTestKeyPair() (*p256k1signer.P256K1Signer, []byte) {
+	signer := p256k1signer.NewP256K1Signer()
 	if err := signer.Generate(); err != nil {
 		panic(err)
 	}

pkg/crypto/encryption/nip44.go

@@ -12,8 +12,9 @@ import (
 	"golang.org/x/crypto/hkdf"
 	"lol.mleku.dev/chk"
 	"lol.mleku.dev/errorf"
-	"next.orly.dev/pkg/crypto/p256k"
+	p256k1signer "p256k1.mleku.dev/signer"
 	"next.orly.dev/pkg/crypto/sha256"
+	"next.orly.dev/pkg/encoders/hex"
 	"next.orly.dev/pkg/interfaces/signer"
 	"next.orly.dev/pkg/utils"
 )
@@ -176,11 +177,16 @@ func GenerateConversationKeyFromHex(pkh, skh string) (ck []byte, err error) {
 		return
 	}
 	var sign signer.I
-	if sign, err = p256k.NewSecFromHex(skh); chk.E(err) {
+	sign = p256k1signer.NewP256K1Signer()
+	var sk []byte
+	if sk, err = hex.Dec(skh); chk.E(err) {
+		return
+	}
+	if err = sign.InitSec(sk); chk.E(err) {
 		return
 	}
 	var pk []byte
-	if pk, err = p256k.HexToBin(pkh); chk.E(err) {
+	if pk, err = hex.Dec(pkh); chk.E(err) {
 		return
 	}
 	var shared []byte