feat: configuration loading and netbox api client

config.yaml next to the script (or $NETBOX_INVENTORY_CONFIG) with environment
variable overrides, requests session with token auth, paginated list fetching
and readable error reporting.

ruff.toml

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2026 Bryan Joshua Pedini
+
+line-length = 100
+target-version = "py310"
+
+[lint]
+select = ["E", "F", "W", "I", "N", "UP", "B", "C4", "SIM"]
+ignore = ["E501"]
+
+[lint.pydocstyle]
+convention = "google"