fix(plugin): add OpenClaw state dir fallback

src/utils/openclaw-state-dir.ts

@@ -0,0 +1,12 @@
+import { homedir } from "node:os";
+import path from "node:path";
+
+export interface OpenClawRuntimeStateLike {
+  resolveStateDir?: () => string;
+}
+
+export function resolveOpenClawStateDir(
+  runtimeState: OpenClawRuntimeStateLike | undefined,
+): string {
+  return runtimeState?.resolveStateDir?.() ?? path.join(homedir(), ".openclaw");
+}