refactor: simplify runtime, config, and telegram (#85)

tests/test_settings_contract.py

@@ -0,0 +1,30 @@
+from pathlib import Path
+
+import pytest
+
+from takopi.config import ConfigError
+from takopi.settings import TakopiSettings, validate_settings_data
+
+
+def test_settings_strips_and_expands_transport_config(tmp_path: Path) -> None:
+    settings = TakopiSettings.model_validate(
+        {
+            "transport": " telegram ",
+            "plugins": {"enabled": [" foo "]},
+            "transports": {"telegram": {"bot_token": "  token  ", "chat_id": 123}},
+        }
+    )
+
+    assert settings.transport == "telegram"
+    assert settings.plugins.enabled == ["foo"]
+    assert settings.transports.telegram.bot_token == "token"
+
+
+def test_settings_rejects_bool_chat_id(tmp_path: Path) -> None:
+    data = {
+        "transport": "telegram",
+        "transports": {"telegram": {"bot_token": "token", "chat_id": True}},
+    }
+
+    with pytest.raises(ConfigError, match="chat_id"):
+        validate_settings_data(data, config_path=tmp_path / "takopi.toml")