fix: registerCommand uses 'name' not 'command', fix handler signature, add missing clearState import

- OpenClaw SDK expects 'name' field in OpenClawPluginCommandDefinition, not 'command'
  (caused TypeError: Cannot read properties of undefined reading 'trim')
- Handler receives { config } not { cfg, reply }, returns ReplyPayload
- Add missing clearState import for /wechat-logout command
- Bump version to 1.0.2

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@henryxiaoyang/wechat-access-unqclawed",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "type": "module",
   "description": "OpenClaw 微信通路插件 — 扫码登录 + AGP WebSocket 双向通信",
   "author": "HenryXiaoYang",