feat: add gateway daemon runtime selector

src/commands/daemon-runtime.ts

@@ -0,0 +1,27 @@
+export type GatewayDaemonRuntime = "node" | "bun";
+
+export const DEFAULT_GATEWAY_DAEMON_RUNTIME: GatewayDaemonRuntime = "node";
+
+export const GATEWAY_DAEMON_RUNTIME_OPTIONS: Array<{
+  value: GatewayDaemonRuntime;
+  label: string;
+  hint?: string;
+}> = [
+  {
+    value: "node",
+    label: "Node (recommended)",
+    hint:
+      "Required for WhatsApp (Baileys WebSocket + Bun can corrupt memory on reconnect)",
+  },
+  {
+    value: "bun",
+    label: "Bun (faster)",
+    hint: "Use only when WhatsApp is disabled",
+  },
+];
+
+export function isGatewayDaemonRuntime(
+  value: string | undefined,
+): value is GatewayDaemonRuntime {
+  return value === "node" || value === "bun";
+}