feat: implement local reporter mode (#126)

* implement local reporter mode

* simplify watcher class

* review changes

* do not update unknown status

* allow empty key patches via api

* fix some pylint warnings in tests

tests/ahriman/models/test_repository_id.py

@@ -60,4 +60,4 @@ def test_lt_invalid() -> None:
     must raise ValueError if other is not valid repository id
     """
     with pytest.raises(ValueError):
-        RepositoryId("x86_64", "a") < 42
+        assert RepositoryId("x86_64", "a") < 42