feat: add crash handler with cache cleanup

Added signal handlers for common crash signals (SIGSEGV, SIGILL,
SIGABRT, SIGFPE) to automatically clean up QML cache directory when
crashes occur in release builds. This prevents corrupted cache from
causing repeated startup failures. The handler first removes the
qmlcache directory, then re-raises the signal to generate core dump
for debugging.

Influence:
1. Test application startup after simulating crashes to verify cache
cleanup works
2. Verify normal operation is unaffected in debug builds (QT_DEBUG
defined)
3. Check that core dumps are still generated for crash analysis
4. Test QML loading performance after cache cleanup to ensure proper
regeneration

feat: 添加崩溃处理及缓存清理功能

为常见崩溃信号（SIGSEGV、SIGILL、SIGABRT、SIGFPE）添加信号处理程序，在
发布版本中发生崩溃时自动清理QML缓存目录。这可以防止损坏的缓存导致重复启
动失败。处理程序会先删除qmlcache目录，然后重新触发信号以生成核心转储用于
调试。

Influence:
1. 模拟崩溃后测试应用启动，验证缓存清理功能正常工作
2. 验证调试版本（定义了QT_DEBUG）的正常操作不受影响
3. 检查崩溃分析所需的核心转储是否仍然生成
4. 测试缓存清理后的QML加载性能，确保正确重新生成

PMS: BUG-313293

Author: caixr23

src/dde-control-center/main.cpp

@@ -11,6 +11,7 @@
 #include <QCommandLineOption>
 #include <QCommandLineParser>
 #include <QDBusConnection>
+#include <QDir>
 #include <QGuiApplication>
 #include <QIcon>
 #include <QQmlApplicationEngine>
@@ -19,10 +20,26 @@
 #include <QStandardPaths>
 #include <QStringList>
 #include <QWindow>
-
+#ifndef QT_DEBUG
+#  include <signal.h>
+#endif
 DGUI_USE_NAMESPACE
-DCORE_USE_NAMESPACE
 
+DCORE_USE_NAMESPACE
+#ifndef QT_DEBUG
+void sig_crash(int signum)
+{
+    // 崩溃了，尝试清下缓存，防止下次还起不来
+    QString qmlCache = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + "/deepin/dde-control-center/qmlcache";
+    QDir dir(qmlCache);
+    if (dir.exists()) {
+        dir.removeRecursively();
+    }
+    // 重新触发信号，产生coredump
+    signal(signum, SIG_DFL);
+    raise(signum);
+}
+#endif
 QString loggingRules(const QString &loggingModule)
 {
     if (loggingModule.isEmpty())
@@ -53,6 +70,19 @@ QStringList defaultpath()
 
 int main(int argc, char *argv[])
 {
+#ifndef QT_DEBUG
+    // 设置信号处理函数
+    struct sigaction sa;
+    sa.sa_handler = sig_crash;
+    sigemptyset(&sa.sa_mask);
+    // 在处理完信号后恢复默认信号处理
+    sa.sa_flags = SA_RESETHAND;
+
+    sigaction(SIGSEGV, &sa, nullptr);
+    sigaction(SIGILL, &sa, nullptr);
+    sigaction(SIGABRT, &sa, nullptr);
+    sigaction(SIGFPE, &sa, nullptr);
+#endif
     QGuiApplication *app = new QGuiApplication(argc, argv);
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     app.setAttribute(Qt::AA_UseHighDpiPixmaps);