fix: resolve device listing bug after buttplug v10 upgrade

Unwrap DeviceList wrapper message before passing to parseDeviceList(),
and rename FeatureDescriptor to FeatureDescription to match Rust v10 serde output.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/buttplug/src/client/ButtplugClient.ts

@@ -96,7 +96,7 @@ export class ButtplugClient extends EventEmitter {
     const leftoverMsgs = this._sorter.ParseIncomingMessages(msgs);
     for (const x of leftoverMsgs) {
       if (x.DeviceList !== undefined) {
-        this.parseDeviceList(x as Messages.DeviceList);
+        this.parseDeviceList(x.DeviceList!);
         break;
       } else if (x.ScanningFinished !== undefined) {
         this._isScanning = false;