feat(pluginmgr): 插件更新接口（upgrade/downgrade 保留配置）+ skill_install overwrite

内核 Registry 拆出 StopAndUnload：
- 停止并从注册表移除插件但保留 config_<name> 表
- 不触发 onRemove 回调（那是删除专用语义）
- RemovePlugin 改为追加清理配置表示清除，更新场景调 StopAndUnload

pluginmgr:
- installFromData/installFromURL/installFromPath 加 overwrite 参数
- 已存在+overwrite=true：StopAndUnload→备份旧目录→解压新包→失败回滚→
  返回 action=upgraded/downgraded/reinstalled+previous_version+config_kept
- 已存在+overwrite=false：返回 error+hint（指向 overwrite 用法）
- cmpVersion 点分版本号数字比较（非字典序）
- 测试覆盖：首次安装→重装拒绝→升级保留配置→降级→失败回滚

skill_install 加 overwrite 参数：
- 同名技能存在时先卸载旧实例+删除目录再安装新包

SDK PluginMgr 接口同步加 StopAndUnload(name string) error

工具链 plugindev 已重建到 /usr/local/bin（7/29→8/25 版本）
QQ 插件诊断日志版（webhook recv 到达+isAtBot 失败日志）已打包并
通过 upgrade 接口热更新部署，配置保留验证通过。

third_party/homeagent-sdk/remotedevice/CMakeLists.txt

@@ -0,0 +1,116 @@
+cmake_minimum_required(VERSION 3.10)
+project(ha_remotedevice VERSION 0.1.0 LANGUAGES C)
+
+# ============================================================
+# ha_remotedevice — HomeAgent 远程设备接入 C SDK
+# 零外部依赖，纯 C 实现，兼容嵌入式平台。
+#
+# 使用方式:
+#   add_subdirectory(path/to/ha_remotedevice)
+#   target_link_libraries(my_app ha_remotedevice)
+#   target_include_directories(my_app PRIVATE
+#     ${HA_REMOTEDEVICE_INCLUDE_DIR})
+# ============================================================
+
+# 选项: 构建为静态库或动态库
+option(BUILD_SHARED_LIBS "Build ha_remotedevice as shared library" OFF)
+
+# 选项: 禁用 malloc/free（用于裸机环境，用户需提供 alloc 回调）
+option(HA_NO_ALLOC  "Disable dynamic memory allocation" OFF)
+
+# 选项: 日志级别
+set(HA_LOG_LEVEL 2 CACHE STRING "Log level: 0=none, 1=error, 2=info, 3=debug")
+
+# 源文件
+set(HA_REMOTEDEVICE_SRC
+    src/ha_remotedevice.c
+    src/ha_json.c
+    src/ha_ws.c
+)
+
+# 头文件
+set(HA_REMOTEDEVICE_INCLUDE
+    ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+
+# 编译选项
+if(HA_NO_ALLOC)
+    add_definitions(-DHA_NO_ALLOC)
+endif()
+add_definitions(-DHA_LOG_LEVEL=${HA_LOG_LEVEL})
+
+# 创建库
+if(BUILD_SHARED_LIBS)
+    add_library(ha_remotedevice SHARED ${HA_REMOTEDEVICE_SRC})
+    if(WIN32)
+        # Windows 需要导出符号
+        set_target_properties(ha_remotedevice PROPERTIES
+            WINDOWS_EXPORT_ALL_SYMBOLS ON)
+    endif()
+else()
+    add_library(ha_remotedevice STATIC ${HA_REMOTEDEVICE_SRC})
+endif()
+
+# 包含目录
+target_include_directories(ha_remotedevice
+    PUBLIC  ${HA_REMOTEDEVICE_INCLUDE}
+    PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src
+)
+
+# 不链接任何外部库
+target_link_libraries(ha_remotedevice PRIVATE)
+
+# 导出包含目录供外部项目使用
+set(HA_REMOTEDEVICE_INCLUDE_DIR
+    ${HA_REMOTEDEVICE_INCLUDE}
+    CACHE INTERNAL "ha_remotedevice include directories")
+
+# 安装规则
+install(TARGETS ha_remotedevice
+    EXPORT  ha_remotedevice-targets
+    LIBRARY DESTINATION lib
+    ARCHIVE DESTINATION lib
+    RUNTIME DESTINATION bin
+    INCLUDES DESTINATION include
+)
+
+install(DIRECTORY include/
+    DESTINATION include
+)
+
+install(EXPORT ha_remotedevice-targets
+    DESTINATION lib/cmake/ha_remotedevice
+    NAMESPACE ha_remotedevice::
+)
+
+# ============================================================
+# 测试（可选）
+# ============================================================
+option(BUILD_TESTS "Build ha_remotedevice tests" OFF)
+
+if(BUILD_TESTS)
+    find_package(Threads REQUIRED)
+
+    add_executable(ha_remotedevice_test
+        test/test_ha_remotedevice.c
+    )
+    target_link_libraries(ha_remotedevice_test
+        PRIVATE ha_remotedevice Threads::Threads
+    )
+    target_include_directories(ha_remotedevice_test
+        PRIVATE ${HA_REMOTEDEVICE_INCLUDE_DIR}
+    )
+
+    # 添加测试
+    add_test(NAME ha_remotedevice_test
+        COMMAND ha_remotedevice_test
+    )
+endif()
+
+# ============================================================
+# 编译信息
+# ============================================================
+message(STATUS "ha_remotedevice ${PROJECT_VERSION}")
+message(STATUS "  Build type: $<CONFIG>")
+message(STATUS "  Shared lib: ${BUILD_SHARED_LIBS}")
+message(STATUS "  No alloc:   ${HA_NO_ALLOC}")