fix: 优化客户端错误提示和校验诊断信息

MainApp/main.cpp

@@ -97,12 +97,14 @@ int main(int argc, char* argv[])
     if (!integrity.verifyInstalledVersion(
             config.getValue("App", "app_id"), config.getValue("App", "channel"),
             config.getValue("App", "current_version")))
-    {
-        QMessageBox::critical(nullptr, "Integrity Check Failed",
-            QString("Application files failed signed Manifest verification:\n%1")
-                .arg(integrity.errorString()));
-        return -1;
-    }
+    {
+        QMessageBox::critical(nullptr, "Integrity Check Failed",
+            QString("Startup blocked because the installed files failed local signed Manifest verification.\n"
+                    "This is not a download check; it means the current installation directory does not match the signed Manifest cache for this version.\n\n"
+                    "Details:\n%1")
+                .arg(integrity.errorString()));
+        return -1;
+    }
 
     MainWindow w;
     w.show();