1、封装 usr_le_code 为静态库，并增加 Release 客户包自动生成工具

2、将 BLE 协议实现收敛为 libusr_le_code.a + 公开头文件，应用侧通过
usr_le_api / usr_le_product 对接；新增 package_release.py，按 version.txt
3、生成去除协议源码的客户交付包，开发工程继续保留完整源码。

apps/usr_le_code/build_lib.bat

@@ -0,0 +1,50 @@
+@echo off
+chcp 65001 >nul
+REM Rebuild apps/usr_le_code/lib/libusr_le_code.a
+REM Double-click this bat; window will pause so you can read the result.
+
+cd /d "%~dp0..\.."
+if errorlevel 1 (
+    echo [FAIL] cannot cd to project root
+    echo SCRIPT dir: %~dp0
+    goto :END
+)
+
+echo ==== build libusr_le_code.a ====
+echo Project root: %CD%
+echo.
+
+SET PATH=%CD%\tools\utils;C:\JL\pi32\bin;%PATH%
+
+where make >nul 2>&1
+if errorlevel 1 (
+    echo [FAIL] make.exe not found
+    echo Check: %CD%\tools\utils\make.exe
+    goto :END
+)
+
+where clang.exe >nul 2>&1
+if errorlevel 1 (
+    echo [FAIL] clang.exe not found
+    echo Check: C:\JL\pi32\bin\clang.exe
+    goto :END
+)
+
+make lib_usr_le -j %NUMBER_OF_PROCESSORS%
+if errorlevel 1 (
+    echo.
+    echo [FAIL] build libusr_le_code.a
+    goto :END
+)
+
+echo.
+if exist "apps\usr_le_code\lib\libusr_le_code.a" (
+    echo [OK] apps\usr_le_code\lib\libusr_le_code.a
+    dir "apps\usr_le_code\lib\libusr_le_code.a"
+) else (
+    echo [FAIL] lib file not found after build
+)
+
+:END
+echo.
+pause