update README.md

fix: use globalThis to share runtime across module instances

chore: bump version to 1.0.2

fix: update version to 1.0.1 in source

fix: add files field to only include dist in npm package

chore: update package name to @junjiezhang/openclaw-wecom-plugin

fix: update plugin for standalone usage

feat: initial release of WeCom plugin for OpenClaw