修复密码凭据污染私钥列表

跳过 SSH 密码凭据命名空间，避免部署服务器列表加载失败，并补充回归测试。

backend/internal/sshkey/service.go

@@ -100,6 +100,10 @@ func (s *Service) List(ctx context.Context) ([]Metadata, error) {
 	}
 	result := make([]Metadata, 0, len(items))
 	for _, item := range items {
+		referenceID := strings.TrimPrefix(item.Reference, ReferencePrefix)
+		if strings.Contains(referenceID, "/") {
+			continue
+		}
 		metadata, err := s.metadata(ctx, item.Reference, item.UpdatedAt, false)
 		if err != nil {
 			return nil, err

backend/internal/sshkey/service_test.go

@@ -42,6 +42,30 @@ func TestServiceCreatesListsValidatesAndDeletesSSHKey(t *testing.T) {
 		t.Fatal("已删除的 SSH 私钥引用不应继续通过校验")
 	}
 }
+func TestServiceListIgnoresSSHPasswordSecrets(t *testing.T) {
+	store, err := secretstore.Open(t.TempDir())
+	if err != nil {
+		t.Fatalf("failed to open secret store: %v", err)
+	}
+	service := NewService(store)
+	if _, err := service.Create(t.Context(), "deployment key", testPrivateKey(t), ""); err != nil {
+		t.Fatalf("failed to create SSH key: %v", err)
+	}
+	if err := store.Put(t.Context(), ReferencePrefix+"password/test-password", map[string]string{
+		"kind":     "ssh_password",
+		"password": "not-for-listing",
+	}); err != nil {
+		t.Fatalf("failed to create password secret: %v", err)
+	}
+
+	items, err := service.List(t.Context())
+	if err != nil {
+		t.Fatalf("failed to list SSH keys: %v", err)
+	}
+	if len(items) != 1 || items[0].Name != "deployment key" {
+		t.Fatalf("password secret leaked into SSH key list: %+v", items)
+	}
+}
 
 func TestServiceRejectsInvalidSSHKeyWithoutLeakingContent(t *testing.T) {
 	store, err := secretstore.Open(t.TempDir())