根据冒号分隔的键路径设置 YAML 映射节点中的值
private static void SetYamlByColonKey(YamlDotNet.RepresentationModel.YamlMappingNode root, string key, string? value);
root YamlDotNet.RepresentationModel.YamlMappingNode
YAML 映射根节点
key System.String
冒号分隔的键路径(如 "Database:Connection:Timeout")
value System.String
要设置的值,为 null 时设置为空字符串