feat(cloudflare): add DNS pointing integration

Implement Cloudflare connection management, pointing groups and members, asynchronous A-record reconciliation, node IP triggers, admin APIs, management pages, migrations, tests, and documentation.

internal/apps/openflare/cloudflare/tasks_test.go

@@ -0,0 +1,19 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package cloudflare
+
+import "testing"
+
+func TestSyncMemberTaskHandlerRejectsTrailingJSONContent(t *testing.T) {
+	handler := &SyncMemberTaskHandler{}
+	for _, payload := range [][]byte{
+		[]byte(`{"member_id":7} {}`),
+		[]byte(`{"member_id":7}}`),
+		[]byte(`{"member_id":7}]`),
+	} {
+		if normalized, err := handler.ValidatePayload(payload); err == nil {
+			t.Errorf("ValidatePayload(%s) = %s, nil; want non-nil error", payload, normalized)
+		}
+	}
+}