fix(api): add deprecated id alias in MMD and streaming KS schedule list responses

The id alias was added to compare_means, kolmogorov_smirnov, and
jensen_shannon in PR #182 but missed in mmd.py and
kolmogorov_smirnov_streaming.py, causing KeyError: 'id' in
integration tests for approxkstest and fouriermmd schedules.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: SudipSinha

src/endpoints/metrics/drift/kolmogorov_smirnov_streaming.py

@@ -336,6 +336,7 @@ async def list_ksteststreaming_requests() -> dict[str, list[dict[str, Any]]]:
                 and hasattr(request, "fit_columns")
             ):
                 request_dict = {
+                    "id": str(request_id),  # deprecated: use requestId
                     "requestId": str(request_id),
                     "modelId": request.model_id,
                     "metricName": METRIC_NAME,

src/endpoints/metrics/drift/mmd.py

@@ -307,6 +307,7 @@ async def list_mmd_requests() -> dict[str, list[dict[str, Any]]]:
             ):
                 requests_list.append(
                     {
+                        "id": str(request_id),  # deprecated: use requestId
                         "requestId": str(request_id),
                         "modelId": request.model_id,
                         "metricName": METRIC_NAME,