refactor(gateway): share restart request parsing

src/gateway/server-methods/restart-request.ts

@@ -0,0 +1,20 @@
+export function parseRestartRequestParams(params: unknown): {
+  sessionKey: string | undefined;
+  note: string | undefined;
+  restartDelayMs: number | undefined;
+} {
+  const sessionKey =
+    typeof (params as { sessionKey?: unknown }).sessionKey === "string"
+      ? (params as { sessionKey?: string }).sessionKey?.trim() || undefined
+      : undefined;
+  const note =
+    typeof (params as { note?: unknown }).note === "string"
+      ? (params as { note?: string }).note?.trim() || undefined
+      : undefined;
+  const restartDelayMsRaw = (params as { restartDelayMs?: unknown }).restartDelayMs;
+  const restartDelayMs =
+    typeof restartDelayMsRaw === "number" && Number.isFinite(restartDelayMsRaw)
+      ? Math.max(0, Math.floor(restartDelayMsRaw))
+      : undefined;
+  return { sessionKey, note, restartDelayMs };
+}