feat: authsession service

authsession/internal/ports/projection_publisher.go

@@ -0,0 +1,15 @@
+package ports
+
+import (
+	"context"
+
+	"galaxy/authsession/internal/domain/gatewayprojection"
+)
+
+// GatewaySessionProjectionPublisher publishes gateway-facing session snapshots
+// after source-of-truth session changes.
+type GatewaySessionProjectionPublisher interface {
+	// PublishSession writes or propagates snapshot in the gateway-facing
+	// projection model.
+	PublishSession(ctx context.Context, snapshot gatewayprojection.Snapshot) error
+}