把 business 层改名为 logic 层，入口改为 mcu_logic，避免 business 语义不清。

目录 business/ → logic/，mcu_business → mcu_logic；Makefile、工程文件和打包脚本里的路径一并改掉。

tools/pack_firmware.ps1

@@ -23,7 +23,7 @@ if ([string]::IsNullOrWhiteSpace($SdkRoot)) {
     $SdkRoot = Join-Path $RepoRoot "JBao_JL7016_MOD_FW"
 }
 
-$VersionHeader = Join-Path $SdkRoot "apps\usr_mcu_bridge\business\mcu_version.h"
+$VersionHeader = Join-Path $SdkRoot "apps\usr_mcu_bridge\logic\mcu_version.h"
 $DownloadDir   = Join-Path $SdkRoot "cpu\br28\tools\download\earphone"
 $ReleaseRoot   = Join-Path $RepoRoot "release"