Add Qtech model and template; clean up Mikrotik model

- Introduced a new `Qtech` model with a corresponding TTP template for parsing QTECH devices.
- Removed commented-out methods in the `Mikrotik` model to improve code clarity and maintainability.

oxi/interfaces/models/mikrotik.py

@@ -7,16 +7,6 @@ from oxi.interfaces.base import BaseDevice
 class Mikrotik(BaseDevice):
     template = "mikrotik.ttp"
 
-    # def system(self) -> "System":
-    #     systems = self._raw.get("system")
-    #     return System(**systems)
-
-    # def interfaces(self) -> "Interfaces":
-    #     return [Interfaces(**item) for item in self._raw.get("interfaces")]
-
-    # def vlans(self) -> list["Vlans"]:
-    #     return [Vlans(**item) for item in self._raw.get("vlans")]
-
 
 if __name__ == "__main__":
     print(os.path.abspath(os.curdir))