feat(api): read zone records without template + snapshot-to-template

LoadDomain requires a template, so a zone without one could never be
viewed or snapshotted. Adds a template-free path: store.LoadZone /
service.ZoneRef / DomainService.ZoneRecords read a zone's live records
straight from the provider (no diff, no template). GET
/domains/{did}/records exposes read-only viewing; POST
/domains/{did}/template-from-zone snapshots only managed record types
(NS/SOA excluded) into a new template and auto-attaches it to the domain.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BwxdSt4reTm7Dj1oxRvpP3

internal/service/service_test.go

@@ -49,6 +49,13 @@ func (l fakeLoader) LoadDomain(context.Context, uuid.UUID, uuid.UUID) (DomainRef
 	return l.ref, nil
 }
 
+// LoadZone mirrors LoadDomain's provider-access fields but — unlike
+// LoadDomain — never errors on a missing template, matching the real
+// store.LoadZone contract.
+func (l fakeLoader) LoadZone(context.Context, uuid.UUID, uuid.UUID) (ZoneRef, error) {
+	return ZoneRef{ZoneID: l.ref.ZoneID, Provider: l.ref.Provider, SecretEnc: l.ref.SecretEnc}, nil
+}
+
 type nopRecorder struct{}
 
 func (nopRecorder) SaveCheckRun(context.Context, uuid.UUID, diff.Changeset) error { return nil }
@@ -78,6 +85,24 @@ func TestCheckProducesDiff(t *testing.T) {
 	}
 }
 
+// TestZoneRecordsReadsProviderDirectly covers the no-template zone-viewing
+// path: ZoneRecords must return the provider's live records with no diff
+// and no template involved (loader's Template field is left zero-valued).
+func TestZoneRecordsReadsProviderDirectly(t *testing.T) {
+	actual := []model.Record{
+		{Type: model.A, Name: "a.example.com.", TTL: 300, Values: []string{"1.1.1.1"}},
+		{Type: model.NS, Name: "example.com.", TTL: 3600, Values: []string{"ns1.example.com."}},
+	}
+	svc, _ := setup(t, actual, dto.TemplateDoc{})
+	recs, err := svc.ZoneRecords(context.Background(), uuid.New(), uuid.New())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(recs) != 2 {
+		t.Fatalf("expected 2 records straight from the provider, got %+v", recs)
+	}
+}
+
 func TestApplyRespectsPruneGuard(t *testing.T) {
 	// зона содержит лишнюю запись b (нет в шаблоне) → Prune-кандидат
 	actual := []model.Record{