_meta lost member

[yuz1]

In the fastmcpp::tools::Tool class constructor, the input_schema parameter strips all sub-members from the "_meta" field except for "session_id".

fastmcpp/src/mcp/handler.cpp

Lines 1960 to 1962 in 9a3ee71

	if (!args.contains("_meta") || !args["_meta"].is_object())
	args["_meta"] = fastmcpp::Json::object();
	args["_meta"]["session_id"] = session_id;