fix: read a Supermicro X10 with only the OOB license over Redfish (0.3.1)

First run against real hardware over Redfish: an X10DRL-i (BMC 3.91) with
SFT-OOB-LIC. Its Redfish tree is recorded under
tests/fixtures/supermicro-x10drl-i-3.91/redfish, scrubbed.

- A resource refused for want of a further license (403 OemLicenseNotPassed)
  no longer fails the getter. Storage then falls back to SimpleStorage. The
  firmware list falls back to the BMC and BIOS versions when UpdateService
  is withheld.
- get_device_warnings reports bmc_license_partial with the licenses and the
  withheld parts (drives, firmware inventory).
- A placeholder system model ("Super Server") is replaced by the board
  (PartNumber, else the chassis model).

tests/fixtures/supermicro-x10drl-i-3.91/redfish/TaskService/index.json

@@ -0,0 +1,18 @@
+{
+ "@odata.context": "/redfish/v1/$metadata#TaskService.TaskService",
+ "@odata.id": "/redfish/v1/TaskService",
+ "@odata.type": "#TaskService.v1_0_0.TaskService",
+ "CompletedTaskOverWritePolicy": "Manual",
+ "DateTime": "2026-10-17T09:24:32+01:00",
+ "Id": "TaskService",
+ "Name": "Tasks Service",
+ "Oem": {},
+ "ServiceEnabled": false,
+ "Status": {
+  "Health": "OK",
+  "State": "Disabled"
+ },
+ "Tasks": {
+  "@odata.id": "/redfish/v1/TaskService/Tasks"
+ }
+}