Update dependencies and refactor p256k crypto package

- Bumped version of lol.mleku.dev from v1.0.4 to v1.0.5.
- Added new dependencies: p256k1.mleku.dev and several indirect dependencies for improved cryptographic functionality.
- Refactored p256k package to utilize p256k1.mleku.dev/signer for signature operations, replacing the previous btcec implementation.
- Removed the secp256k1.go file, consolidating the crypto logic under the new p256k1 library.
- Updated documentation to reflect changes in the signer interface and usage.

pkg/crypto/p256k/helpers-btcec.go

@@ -0,0 +1,41 @@
+//go:build !cgo
+
+package p256k
+
+import (
+	"lol.mleku.dev/chk"
+	"next.orly.dev/pkg/encoders/hex"
+	"next.orly.dev/pkg/interfaces/signer"
+	p256k1signer "p256k1.mleku.dev/signer"
+)
+
+func NewSecFromHex[V []byte | string](skh V) (sign signer.I, err error) {
+	sk := make([]byte, len(skh)/2)
+	if _, err = hex.DecBytes(sk, []byte(skh)); chk.E(err) {
+		return
+	}
+	sign = p256k1signer.NewBtcecSigner()
+	if err = sign.InitSec(sk); chk.E(err) {
+		return
+	}
+	return
+}
+
+func NewPubFromHex[V []byte | string](pkh V) (sign signer.I, err error) {
+	pk := make([]byte, len(pkh)/2)
+	if _, err = hex.DecBytes(pk, []byte(pkh)); chk.E(err) {
+		return
+	}
+	sign = p256k1signer.NewBtcecSigner()
+	if err = sign.InitPub(pk); chk.E(err) {
+		return
+	}
+	return
+}
+
+func HexToBin(hexStr string) (b []byte, err error) {
+	if b, err = hex.DecAppend(b, []byte(hexStr)); chk.E(err) {
+		return
+	}
+	return
+}