feat(ssh-tunnel-qt): add application icon support for cross-platform display

- Add Contents.json for macOS icon asset catalog with multiple resolutions
- Configure project.yml to include Windows PE icon resource
- Include QIcon header and implement applicationIcon() function
- Set window icons for main application and tunnel windows
- Add qrc file to embed icon resources into the application
- Update README to document multi-DPI icon support across platforms

examples/ssh-tunnel-qt/README.md

@@ -24,6 +24,8 @@
 - 启动时检查全部持久化规则，未运行的隧道会自动启动。
 - JSON 配置原子写入、`fsync` 和双份备份，主配置损坏时自动恢复。
 - 使用 `QProcess(program, arguments)`，不经过 shell。
+- 应用图标内嵌到程序中，支持 Linux、macOS 和 Windows 多 DPI 显示；Windows
+  可执行文件同时携带 PE 图标资源。
 
 ## 分层
 

examples/ssh-tunnel-qt/cpp-src/qt_tunnel.cc

@@ -14,6 +14,7 @@
 #include <QGroupBox>
 #include <QHBoxLayout>
 #include <QHeaderView>
+#include <QIcon>
 #include <QLabel>
 #include <QLineEdit>
 #include <QMainWindow>
@@ -48,6 +49,18 @@ static char qt_program_name[] = "typephp-ssh-tunnel-manager";
 static char *qt_argv[] = {qt_program_name, nullptr};
 static QApplication *qt_application = nullptr;
 
+QIcon applicationIcon() {
+    QIcon icon;
+    icon.addFile(":/icons/icon_16.png");
+    icon.addFile(":/icons/icon_32.png");
+    icon.addFile(":/icons/icon_64.png");
+    icon.addFile(":/icons/icon_128.png");
+    icon.addFile(":/icons/icon_256.png");
+    icon.addFile(":/icons/icon_512.png");
+    icon.addFile(":/icons/icon_1024.png");
+    return icon;
+}
+
 QString toQString(const Variant &value) {
     if (value.isNull() || value.isUndef()) {
         return {};
@@ -235,6 +248,7 @@ class TunnelWindowBox final : public Box {
     explicit TunnelWindowBox(const QString &title) {
         window_ = new QMainWindow();
         window_->setWindowTitle(title);
+        window_->setWindowIcon(QApplication::windowIcon());
         window_->resize(1120, 720);
 
         auto *central = new QWidget();
@@ -698,6 +712,7 @@ var php_qt_tunnel_create(String title) {
         qt_application = new QApplication(qt_argc, qt_argv);
         qt_application->setApplicationName("TypePHP SSH Tunnel Manager");
         qt_application->setOrganizationName("TypePHP");
+        qt_application->setWindowIcon(applicationIcon());
     }
     return {new TunnelWindowBox(toQString(title))};
 }

examples/ssh-tunnel-qt/icon/Contents.json

@@ -0,0 +1,18 @@
+{
+  "images" : [
+    { "filename" : "icon_16.png", "idiom" : "mac", "scale" : "1x", "size" : "16x16" },
+    { "filename" : "icon_32.png", "idiom" : "mac", "scale" : "2x", "size" : "16x16" },
+    { "filename" : "icon_32.png", "idiom" : "mac", "scale" : "1x", "size" : "32x32" },
+    { "filename" : "icon_64.png", "idiom" : "mac", "scale" : "2x", "size" : "32x32" },
+    { "filename" : "icon_128.png", "idiom" : "mac", "scale" : "1x", "size" : "128x128" },
+    { "filename" : "icon_256.png", "idiom" : "mac", "scale" : "2x", "size" : "128x128" },
+    { "filename" : "icon_256.png", "idiom" : "mac", "scale" : "1x", "size" : "256x256" },
+    { "filename" : "icon_512.png", "idiom" : "mac", "scale" : "2x", "size" : "256x256" },
+    { "filename" : "icon_512.png", "idiom" : "mac", "scale" : "1x", "size" : "512x512" },
+    { "filename" : "icon_1024.png", "idiom" : "mac", "scale" : "2x", "size" : "512x512" }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

examples/ssh-tunnel-qt/icon/ssh_tunnel_icons.qrc

@@ -0,0 +1,11 @@
+<RCC>
+    <qresource prefix="/icons">
+        <file>icon_16.png</file>
+        <file>icon_32.png</file>
+        <file>icon_64.png</file>
+        <file>icon_128.png</file>
+        <file>icon_256.png</file>
+        <file>icon_512.png</file>
+        <file>icon_1024.png</file>
+    </qresource>
+</RCC>

examples/ssh-tunnel-qt/project.yml

@@ -8,6 +8,11 @@ sources:
   - php-src
   - cpp-src
 
+resource:
+  # Used as the Windows PE/Explorer icon. Qt's in-window icon is embedded in
+  # cpp-src/ssh_tunnel_icons.cc so it also works on Linux and macOS.
+  icon: icon/ssh_tunnel_manager.ico
+
 # Debian/Ubuntu Qt 6 development package layout. For a non-system Qt SDK,
 # replace these flags with the paths printed by:
 #   pkg-config --cflags --libs Qt6Widgets