[taskboard] add direct host dispatch targets

app/api/tasks/[id]/callback/route.ts

@@ -19,6 +19,7 @@ export async function POST(
     detail?: string | null;
     completed_by?: string | null;
     last_error?: string | null;
+    last_dispatch_at?: string | null;
   };
 
   const updated = await applyTaskCallback(numericId, payload);

app/layout.tsx

@@ -6,7 +6,7 @@ import { AppShell } from "@/components/app-shell";
 
 export const metadata: Metadata = {
   title: "Claw Fleet Console",
-  description: "OpenClaw and ZeroClaw fleet dashboard",
+  description: "OpenClaw, ZeroClaw, and direct host operations dashboard",
 };
 
 export default async function RootLayout({