Module msg_header 

集中 MsgHeader builder (v1.4.110 P0-1)

取代 v1.4.110 之前散落 15+ 处直接 odr_sys_cmn::MsgHeader { ... } / sim_odr_sys_cmn::MsgHeader { ... } / trade_cmn::CryptoMsgHeader { ... } 构造模式. req_id 一律走 crate::trade_query::create_backend_req_id 派生, 防 v1.4.109 P0 类 dedupe bug (req_id 固定 → backend 幂等 cache → 误返 stale order echo). 见 essentials/2026-05-16-0725-v1.4.109-place-order-msgheader-req-id-not-unique-root-cause-codex-handoff-zh.md.

配套 pre-push Check 6 (.githooks/pre-push, v1.4.110 P0-4) 用 grep 拦截 任何新加的直接构造, 强制走本 module 的 builder.

三个 shape 差异

• build_real → odr_sys_cmn::MsgHeader (real account, 7 fields, 含 sub_account_id)
• build_sim → sim_odr_sys_cmn::MsgHeader (sim account, 7 fields, 含 market 替代 sub_account_id)
• build_crypto → trade_cmn::CryptoMsgHeader (crypto, 仅 3 fields)

Functions

build_crypto

构造 crypto trade_cmn::CryptoMsgHeader (仅 3 字段).

build_real

构造 real-account odr_sys_cmn::MsgHeader.

build_sim

构造 sim-account sim_odr_sys_cmn::MsgHeader.