Update project configuration and dependencies

- Added `.vscode` to `.gitignore` to exclude Visual Studio Code settings.
- Updated `pyproject.toml` to include `ruff` for linting and configured its settings.
- Modified `uv.lock` to include `ruff` in both optional and development dependencies.
- Refactored type hints in several files to use `str | None` for optional parameters.
- Cleaned up unused imports and whitespace in various modules for improved code clarity.

oxi/interfaces/models/h3c.py

@@ -14,4 +14,4 @@ class H3C(BaseDevice):
                 vlans.append(item)
                 continue
             vlans.extend({"vlan_id": vlan_id} for vlan_id in vlan_ids)
-        return vlans
+        return vlans