feat: bearer auth for netbox 4.5 v2 api tokens

v2 tokens (nbt_<key>.<secret>) are sent as Authorization: Bearer, legacy
tokens keep the Token scheme; NetBox drops legacy token support in 4.7.

netbox_inventory.py

@@ -66,6 +66,18 @@ def _extract_error_message(response: requests.Response) -> str:
     return f"NetBox API error: HTTP {response.status_code}"
 
 
+def auth_header(token: str) -> str:
+    """
+    Build the Authorization header value for a NetBox API token.
+
+    Version 2 tokens (NetBox 4.5+, "nbt_<key>.<secret>") use the Bearer
+    scheme, legacy tokens the Token scheme.
+    """
+    if token.startswith("nbt_"):
+        return f"Bearer {token}"
+    return f"Token {token}"
+
+
 class NetBoxClient:
     """Thin wrapper around the NetBox REST API."""
 
@@ -76,7 +88,7 @@ class NetBoxClient:
         self._session.verify = verify_ssl
         self._session.headers.update(
             {
-                "Authorization": f"Token {token}",
+                "Authorization": auth_header(token),
                 "Accept": "application/json",
             }
         )