feat(caddy): CLI command to list certificates stored in the Uncloud cluster storage for Caddy

pkg/api/caddy_certificate.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"crypto/sha256"
 	"crypto/x509"
 	"encoding/json"
 	"encoding/pem"
@@ -23,6 +24,11 @@ type IssuedCertificate struct {
 	IssuerData CertificateIssuerData
 }
 
+// Fingerprint returns the SHA-256 fingerprint of the leaf certificate.
+func (c IssuedCertificate) Fingerprint() [sha256.Size]byte {
+	return sha256.Sum256(c.Chain[0].Raw)
+}
+
 // CertificateIssuerData preserves issuer-specific metadata and provides a best-effort typed view of ACME records.
 type CertificateIssuerData struct {
 	// Raw is the original issuer_data JSON, including unrecognized formats and fields.