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/protocol/nwc/crypto_test.go

@@ -6,10 +6,10 @@ import (
 	"time"
 
 	"next.orly.dev/pkg/crypto/encryption"
-	p256k1signer "p256k1.mleku.dev/signer"
 	"next.orly.dev/pkg/encoders/event"
 	"next.orly.dev/pkg/encoders/hex"
 	"next.orly.dev/pkg/encoders/tag"
+	"next.orly.dev/pkg/interfaces/signer/p8k"
 	"next.orly.dev/pkg/protocol/nwc"
 	"next.orly.dev/pkg/utils"
 )
@@ -101,7 +101,7 @@ func TestNWCEventCreation(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	clientKey := p256k1signer.NewP256K1Signer()
+	clientKey := p8k.MustNew()
 	if err := clientKey.InitSec(secretBytes); err != nil {
 		t.Fatal(err)
 	}

pkg/protocol/nwc/mock_wallet_service.go

@@ -10,7 +10,7 @@ import (
 
 	"lol.mleku.dev/chk"
 	"next.orly.dev/pkg/crypto/encryption"
-	p256k1signer "p256k1.mleku.dev/signer"
+	"next.orly.dev/pkg/interfaces/signer/p8k"
 	"next.orly.dev/pkg/encoders/event"
 	"next.orly.dev/pkg/encoders/filter"
 	"next.orly.dev/pkg/encoders/hex"
@@ -40,7 +40,10 @@ func NewMockWalletService(
 	relay string, initialBalance int64,
 ) (service *MockWalletService, err error) {
 	// Generate wallet keypair
-	walletKey := p256k1signer.NewP256K1Signer()
+	var walletKey *p8k.Signer
+	if walletKey, err = p8k.New(); chk.E(err) {
+		return
+	}
 	if err = walletKey.Generate(); chk.E(err) {
 		return
 	}

pkg/protocol/nwc/uri.go

@@ -6,7 +6,7 @@ import (
 
 	"lol.mleku.dev/chk"
 	"next.orly.dev/pkg/crypto/encryption"
-	p256k1signer "p256k1.mleku.dev/signer"
+	"next.orly.dev/pkg/interfaces/signer/p8k"
 	"next.orly.dev/pkg/encoders/hex"
 	"next.orly.dev/pkg/interfaces/signer"
 )
@@ -67,7 +67,10 @@ func ParseConnectionURI(nwcUri string) (parts *ConnectionParams, err error) {
 		err = errors.New("invalid secret")
 		return
 	}
-	clientKey := p256k1signer.NewP256K1Signer()
+	var clientKey *p8k.Signer
+	if clientKey, err = p8k.New(); chk.E(err) {
+		return
+	}
 	if err = clientKey.InitSec(secretBytes); chk.E(err) {
 		return
 	}