docs(changelogs-v2): 回写 #5827/#5876/#5899 前端消费结论

- #5827 implemented (753503c8):向导 4 步改 3 步提交即派定,删 Step3DriverConfirm
  +useDispatchMessage,三写端点顶层 sendItinerarySms。
- #5876 implemented (1f716683):finalize 软预警改读 item.message,兼容过渡期字符串。
- #5899 not_required:纯后端状态机修复,前端只读字段不变自动受益。

changelogs-v2/2026-08/12_5899_改订单人数后车务未重走配车-修复-管理后台.md

@@ -8,10 +8,10 @@ author: "wx(GIT)"
 backend_status: "deployed"
 gateway_status: "not_required"
 frontend_status: "not_required"
-frontend_owner: ""
+frontend_owner: "mmg"
 frontend_ref: ""
 target_release: ""
-verified_at: ""
+verified_at: "2026-08-12"
 status_note: "后端已修复并部署测试服，API 实测通过。修改订单人数/车型等（服务日期窗不变）的换版后，车务看板正确回到「待派车」，订单侧停留在「待配」，不再被自动拉回「配车完成」；车务重新确认后订单正常推进。改行程天数/改出发日期不受影响。"
 updated_at: "2026-08-12"
 base: "dev-v3"