Add ttp dependency and refactor OxiAPI and NodeConfig classes

- Added `ttp` as a dependency in `pyproject.toml` and `uv.lock`.
- Updated `NodeConfig` to store model names in lowercase.
- Refactored `OxiAPI` to always create a new session and added a `close` method.
- Removed unnecessary logging in `Node` class.
- Introduced interfaces for device registration with a new `BaseDevice` class and a `register_parser` function.
- Created initial structure for device models, including a `Mikrotik` parser.

oxi/interfaces/__init__.py

@@ -0,0 +1,21 @@
+from typing import Callable, Type
+
+from .base import BaseDevice
+
+device_registry = {}
+
+
+def register_parser(
+    name: list[str],
+) -> Callable[[Type[BaseDevice]], Type[BaseDevice]]:
+    def wrapper(cls):
+        for item in name:
+            device_registry[item.lower()] = cls
+        return cls
+
+    return wrapper
+
+
+from . import models  # noqa: E402, F401
+
+__all__ = ["register_parser", "device_registry"]