refactor(gateway): split server runtime

src/gateway/server-mobile-nodes.ts

@@ -0,0 +1,16 @@
+type BridgeLike = {
+  listConnected?: () => Array<{ platform?: string | null }>;
+};
+
+const isMobilePlatform = (platform: unknown): boolean => {
+  const p = typeof platform === "string" ? platform.trim().toLowerCase() : "";
+  if (!p) return false;
+  return (
+    p.startsWith("ios") || p.startsWith("ipados") || p.startsWith("android")
+  );
+};
+
+export function hasConnectedMobileNode(bridge: BridgeLike | null): boolean {
+  const connected = bridge?.listConnected?.() ?? [];
+  return connected.some((n) => isMobilePlatform(n.platform));
+}