feat: add vault module

x/vault/client/dwn/state/openid.go

@@ -0,0 +1,23 @@
+package state
+
+import (
+	"github.com/labstack/echo/v4"
+)
+
+func grantAuthorization(e echo.Context) error {
+	// Implement authorization endpoint using passkey authentication
+	// Store session data in cache
+	return nil
+}
+
+func getJWKS(e echo.Context) error {
+	// Implement token endpoint
+	// Use cached session data for validation
+	return nil
+}
+
+func getToken(e echo.Context) error {
+	// Implement token endpoint
+	// Use cached session data for validation
+	return nil
+}