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/core.py

@@ -7,13 +7,12 @@ class OxiAPI:
     def __init__(
         self,
         url: str,
-        session: Optional[Session] = None,
         username: Optional[str] = None,
         password: Optional[str] = None,
         verify: bool = True,
     ):
         self.base_url = url.rstrip("/")
-        self._session = session or Session()
+        self._session = Session()
         self._session.verify = verify
         if username and password:
             self._session.auth = (username, password)
@@ -23,13 +22,7 @@ class OxiAPI:
         return self
 
     def __exit__(self, *args):
-        self._session.close()
+        self.close()
 
-    def get(self, endpoint: str, **kwargs) -> dict:
-        url = f"{self.base_url}/{endpoint.lstrip('/')}"
-        if not url.endswith(".json"):
-            url += ".json"
-        result = self._session.get(url, **kwargs)
-        if result.status_code == 500:
-            raise ValueError(f"page {url} not found")
-        return result.json()
+    def close(self):
+        return self._session.close()