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/__init__.py

@@ -3,5 +3,5 @@ import pkgutil
 
 package = __package__
 
-for loader, module_name, is_pkg in pkgutil.iter_modules(__path__):
+for _, module_name, _ in pkgutil.iter_modules(__path__):
     importlib.import_module(f"{package}.{module_name}")

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

oxi/interfaces/models/keenetic.py

@@ -1,4 +1,5 @@
 from ipaddress import ip_interface
+
 from oxi.interfaces import register_parser
 from oxi.interfaces.base import BaseDevice
 from oxi.interfaces.utils import decode_utf