fix: resolve exported type stuttering issues (revive)

- Rename VaultMetadata to Metadata in internal/vault package to avoid stuttering
- Rename BIP85DRNG to DRNG in pkg/bip85 package to avoid stuttering
- Update all references in code and tests

internal/secret/version.go

@@ -51,6 +51,7 @@ func NewVersion(vault VaultInterface, secretName string, version string) *Versio
 	)
 
 	now := time.Now()
+
 	return &Version{
 		SecretName: secretName,
 		Version:    version,
@@ -219,6 +220,7 @@ func (sv *Version) Save(value []byte) error {
 	}
 
 	Debug("Successfully saved secret version", "version", sv.Version, "secret_name", sv.SecretName)
+
 	return nil
 }
 
@@ -277,6 +279,7 @@ func (sv *Version) LoadMetadata(ltIdentity *age.X25519Identity) error {
 
 	sv.Metadata = metadata
 	Debug("Successfully loaded version metadata", "version", sv.Version)
+
 	return nil
 }
 
@@ -344,6 +347,7 @@ func (sv *Version) GetValue(ltIdentity *age.X25519Identity) ([]byte, error) {
 		"version", sv.Version,
 		"value_length", len(value),
 		"is_empty", len(value) == 0)
+
 	return value, nil
 }
 
@@ -392,6 +396,7 @@ func GetCurrentVersion(fs afero.Fs, secretDir string) (string, error) {
 			if len(parts) >= 2 && parts[0] == "versions" {
 				return parts[1], nil
 			}
+
 			return "", fmt.Errorf("invalid current version symlink format: %s", target)
 		}
 	}