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.

pyproject.toml

@@ -10,7 +10,8 @@ readme = "README.md"
 requires-python = ">=3.13"
 dependencies = [
     "requests>=2.32.5",
+    "ttp>=0.10.0",
 ]
 [tool.setuptools.packages.find]
 where = ["."]
-include = ["oxi*"]
+include = ["oxi*"]