✨ Feature: 新增 dotenv 嵌套配置项支持 (#1324)

Co-authored-by: hemengyang <hmy0119@hotmail.com>

tests/test_init.py

@@ -29,6 +29,10 @@ async def test_init(nonebug_init):
     assert config.config_override == "new"
     assert config.config_from_init == "init"
     assert config.common_config == "common"
+    assert config.common_override == "new"
+    assert config.nested_dict == {"a": 1, "b": 2, "c": {"d": 3}}
+    assert config.nested_missing_dict == {"a": 1, "b": {"c": 2}}
+    assert config.not_nested == "some string"
 
 
 @pytest.mark.asyncio