Constant INTERNAL_UI_CLIENT_ID 

pub const INTERNAL_UI_CLIENT_ID: &'static str;

单个客户端连接 C++ internal UI transport identity used only to reach the pre-login Verification flow without waiting for ordinary InitConnect completion.

Ref: Src/APIServer/Business/APIServer_InitConnect.cpp:6,41-76 defines UIClientID and makes it the sole client allowed to complete InitConnect while gateway initialization is pending. This cannot come from server configuration because it is a peer-selected wire constant. It becomes invalid if upstream changes/removes that exact special case; replace it only when the C++ oracle and pre-login Verification transport change together.