Log the waits on exit

So a log from a process that never exits shows which step it hung in.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

UI/NativeApp.cpp

@@ -1862,11 +1862,15 @@ void NativeShutdown() {
 
 	g_i18nrepo.LogMissingKeys();
 
+	// Each of these waits for a thread. Log them, so a hang on exit shows which one it was.
+	INFO_LOG(Log::System, "Shutting down the web server");
 	ShutdownWebServer();
 
+	INFO_LOG(Log::System, "Shutting down UPnP");
 	__UPnPShutdown();
 
 	// A request finishing while globals are destroyed at exit touches g_OSD, which may be gone by then.
+	INFO_LOG(Log::System, "Cancelling downloads");
 	g_DownloadManager.CancelAll();
 
 	net::Shutdown();
@@ -1875,6 +1879,7 @@ void NativeShutdown() {
 
 	ShaderTranslationShutdown();
 
+	INFO_LOG(Log::System, "Stopping the thread pool");
 	// Avoid shutting this down when restarting core.
 	g_logManager.Shutdown();
 	g_threadManager.Teardown();