feat: add xFusion iBMC Redfish profile

Matches on ServiceRootVendor "xFusion" and OEM namespace "xFusion"
(score 90+). Enables GenericGraphicsControllerDedup unconditionally and
ProcessorGPUFallback when GPU-type processors are present in the snapshot
(xFusion G5500 V7 exposes H200s simultaneously in PCIeDevices,
GraphicsControllers, and Processors/Gpu* — all three need dedup).

Without this profile, xFusion fell into fallback mode which activated all
vendor profiles (Supermicro, HGX, MSI, Dell) unnecessarily. Now resolves
to matched mode with targeted acquisition tuning (120k cap, 75s baseline).

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

internal/collector/redfishprofile/testdata/xfusion-g5500v7.json

@@ -0,0 +1,24 @@
+{
+  "ServiceRootVendor": "xFusion",
+  "ServiceRootProduct": "G5500 V7",
+  "SystemManufacturer": "OEM",
+  "SystemModel": "G5500 V7",
+  "SystemSKU": "",
+  "ChassisManufacturer": "OEM",
+  "ChassisModel": "G5500 V7",
+  "ManagerManufacturer": "XFUSION",
+  "OEMNamespaces": ["xFusion"],
+  "ResourceHints": [
+    "/redfish/v1/Chassis/1",
+    "/redfish/v1/Chassis/1/Drives",
+    "/redfish/v1/Chassis/1/PCIeDevices",
+    "/redfish/v1/Chassis/1/Sensors",
+    "/redfish/v1/Managers/1",
+    "/redfish/v1/Systems/1",
+    "/redfish/v1/Systems/1/GraphicsControllers",
+    "/redfish/v1/Systems/1/Processors",
+    "/redfish/v1/Systems/1/Processors/Gpu1",
+    "/redfish/v1/Systems/1/Storages",
+    "/redfish/v1/UpdateService/FirmwareInventory"
+  ]
+}