feat: 实现网络速度监控任务栏插件

- 添加 C++ 后端 NetworkMonitorApplet，监控网络下载/上传速度
- 添加 QML 前端 networkview.qml，显示实时速度和流量统计
- 支持多网络接口切换
- 任务栏图标显示实时速度，高速时变色
- 悬停显示速度摘要，点击显示详细信息弹窗
- 添加安装脚本 install.sh
- 添加 .gitignore 排除构建目录

CMakeLists.txt

@@ -1,7 +1,39 @@
 cmake_minimum_required(VERSION 3.16)
 
-project(JNetApplet)
+project(JNetApplet VERSION 1.0.0 LANGUAGES CXX)
 
-find_package(DDEShell REQUIRED NO_MODULE)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_AUTOMOC ON)
 
-ds_install_package(PACKAGE space.jokul.JNetApplet)
+find_package(Qt6 REQUIRED COMPONENTS Core Quick DBus)
+find_package(Dtk6 REQUIRED COMPONENTS Core)
+find_package(DDEShell REQUIRED)
+
+# 插件 ID
+set(PLUGIN_ID "space.jokul.JNetApplet")
+
+add_library(space.jokul.JNetApplet SHARED
+    networkmonitorapplet.h
+    networkmonitorapplet.cpp
+)
+
+set_target_properties(space.jokul.JNetApplet PROPERTIES PREFIX "")
+
+target_include_directories(space.jokul.JNetApplet PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    /usr/include/dde-shell
+)
+
+target_link_libraries(space.jokul.JNetApplet PRIVATE
+    Qt6::Core
+    Qt6::Quick
+    Qt6::DBus
+    Dtk6::Core
+    Dde::Shell
+)
+
+# 安装到dde-shell插件目录
+install(TARGETS space.jokul.JNetApplet DESTINATION /usr/lib/x86_64-linux-gnu/dde-shell)
+install(FILES package/metadata.json DESTINATION /usr/share/dde-shell/${PLUGIN_ID})
+install(FILES package/networkview.qml DESTINATION /usr/share/dde-shell/${PLUGIN_ID})