refactor: rework configuration models, add CLI, tests and VSCode settings

- Replace hardcoded CONFIG_PATH with appdirs AppDirs (use app.user_config_dir) and update SETTINGS_PATH
- Rework dataclasses: add Library, QbitTorrent; convert Komga.libraries to List[Library]; use Path for media_path; add getLibraryByName and proper __post_init__ conversions
- Extend KomGrabber to support downloader/downloader_settings (aria2/qbit), normalize Path handling and expanduser usage
- Add type fixes, utility methods (getattr/_setattr) and API __post_init__ to convert nested dicts to dataclass instances
- Add package CLI entrypoints (__main__.py, src package main) and simple runner (main.py)
- Add tests for package __init__ CLI and config behavior (tests/*) and a small test script (test.py)
- Add .vscode/settings.json for pytest integration
- Tidy pyproject.toml: format dependencies, add dev/test dependency groups and fix trailing newline in bumpversion section

tests/test_config.py

@@ -0,0 +1,18 @@
+from komconfig import KomConfig
+import pytest
+
+
+@pytest.fixture
+def komconfig():
+    return KomConfig()
+
+
+def test_komconfig(komconfig):
+    assert komconfig is not None
+
+
+def test_general(komconfig):
+    assert KomConfig().general.log_file == "/var/log/komgrabber.log"
+    assert KomConfig().general.log_level == "INFO"
+
+