fix: use 'device' instead of 'device_id' for interface creation

NetBox API requires 'device' field for creation, not 'device_id'.
Separated search and create logic for interfaces.

scripts/provision_fabric.py

@@ -698,11 +698,18 @@ def create_interfaces(nb: pynetbox.api, devices: dict) -> dict:
             continue
 
         for intf_name, intf_type in interfaces:
-            intf, created = get_or_create(
-                nb.dcim.interfaces,
-                {"device_id": device.id, "name": intf_name},
-                {"type": intf_type},
-            )
+            # Search with device_id but create with device
+            existing = nb.dcim.interfaces.get(device_id=device.id, name=intf_name)
+            if existing:
+                intf = existing
+                created = False
+            else:
+                intf = nb.dcim.interfaces.create({
+                    "device": device.id,
+                    "name": intf_name,
+                    "type": intf_type,
+                })
+                created = True
 
             # Set custom fields for MLAG peer-link
             if intf_name in ("Ethernet10", "Port-Channel10") and device_name.startswith("leaf"):