fix(api): add deprecated id alias in MMD list response

Match PR #182 pattern — include both id and requestId in list
response for Java API compatibility.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Sudip Sinha <Sudip.Sinha@RedHat.com>

Author: SudipSinha

src/endpoints/metrics/drift/mmd.py

@@ -314,6 +314,7 @@ async def list_mmd_requests(
             ):
                 requests_list.append(
                     {
+                        "id": str(request_id),  # deprecated: use requestId
                         "requestId": str(request_id),
                         "modelId": request.model_id,
                         "metricName": METRIC_NAME,