Create rule flow core infrastructure and routing

app/create/layout.tsx

@@ -0,0 +1,24 @@
+"use client";
+
+import type { ReactNode } from "react";
+import { CreateFlowProvider } from "./context/CreateFlowContext";
+
+/**
+ * Layout for the Create Rule Flow
+ * 
+ * Provides a full-screen layout without the root layout's TopNav/Footer.
+ * This layout wraps all create flow pages and provides the CreateFlowContext.
+ */
+export default function CreateFlowLayout({
+  children,
+}: {
+  children: ReactNode;
+}) {
+  return (
+    <CreateFlowProvider>
+      <div className="min-h-screen bg-black flex flex-col">
+        {children}
+      </div>
+    </CreateFlowProvider>
+  );
+}