feat: 重连时 MD5 校验模型列表，有变化才更新 openclaw.json

- 新增 computeModelsMd5()：对模型 id 列表排序后取 MD5
- 新增 refreshModelsIfChanged()：读现有 provider 配置拉新模型，MD5 不同才写盘
- client.js: 重连(active + 无完整 provider)时调用 refreshModelsIfChanged，而非直接跳过

Made-with: Cursor

lib/client.js

@@ -12,7 +12,7 @@ const { getDashboardInfo, resolveOpenclawConfigFile, startTtyd, FrpcManager } =
 const { ProvisionManager } = require('./provisioning');
 const { BtMonitor }        = require('./bt-monitor');
 const { hasInternet, hasWiredInternetProbe, getLocalIps } = require('./network');
-const { applyFullProviderFromVps, removeProviderByName, isFullProvider } = require('./openclaw-provider');
+const { applyFullProviderFromVps, removeProviderByName, refreshModelsIfChanged, isFullProvider } = require('./openclaw-provider');
 const led = require('./led');
 
 const MAX_BACKOFF_MS      = 60_000;
@@ -469,7 +469,10 @@ class ClawClient {
           this._updateOpenClawOrigin(clawIdStr);
         });
       } else {
-        this._updateOpenClawOrigin(clawIdStr);
+        // 重连场景：检查模型列表是否有变化，有变化才写盘
+        refreshModelsIfChanged(() => {
+          this._updateOpenClawOrigin(clawIdStr);
+        });
       }
     }
   }