feat: add fee workspace and polish AI presentation

app/(app)/app/[organizationSlug]/billing/page.tsx

@@ -0,0 +1,5 @@
+import BillingPage from "../../billing/page";
+
+export default async function ScopedBillingPage(): Promise<React.ReactElement> {
+  return BillingPage();
+}

app/(app)/app/billing/page.tsx

@@ -0,0 +1,20 @@
+import { redirect } from "next/navigation";
+
+import { BillingWorkspaceClient } from "@/modules/billing/components/BillingWorkspaceClient";
+import { createInitialBillingStatements } from "@/modules/billing/lib/presentation-data";
+import { getCurrentAuthContext } from "@/modules/core/server/auth";
+import { hasPermission } from "@/modules/core/server/permissions";
+import { getWorkspaceHref } from "@/modules/shared/lib/workspace-routing";
+
+export default async function BillingPage(): Promise<React.ReactElement> {
+  const context = await getCurrentAuthContext();
+  if (!context) {
+    redirect("/login");
+  }
+
+  if (!context.organization || !hasPermission(context.permissions, "admission:manage")) {
+    redirect(getWorkspaceHref(context.organization?.slug, "/dashboard"));
+  }
+
+  return <BillingWorkspaceClient initialStatements={createInitialBillingStatements()} />;
+}