vibechat: single-instance (QLockFile) + переименование Chat→vibechat (бинарник, конфиг, hostname node name)

tools/chatgui/src/main.cpp

@@ -2,6 +2,9 @@
 #include <QPalette>
 #include <QStyleFactory>
 #include <QDir>
+#include <QFile>
+#include <QLockFile>
+#include <QMessageBox>
 #include <cstdio>
 #ifdef _WIN32
 #include <windows.h>
@@ -55,9 +58,16 @@ static struct ShutdownSentinel {
 
 int main(int argc, char *argv[]) {
     QApplication app(argc, argv);
-    app.setApplicationName("Chat");
+    app.setApplicationName("vibechat");
     app.setQuitOnLastWindowClosed(false);
 
+    /* single-instance: лог/БД/сокеты конфликтуют при втором запуске */
+    QLockFile lock(QCoreApplication::applicationDirPath() + "/vibechat.lock");
+    if (!lock.tryLock()) {
+        QMessageBox::warning(nullptr, "vibechat", "vibechat is already running.");
+        return 1;
+    }
+
     app.setStyle(QStyleFactory::create("Fusion"));
     QPalette p;
     p.setColor(QPalette::Window,          QColor(53, 53, 53));
@@ -77,13 +87,17 @@ int main(int argc, char *argv[]) {
     p.setColor(QPalette::Disabled, QPalette::ButtonText, QColor(127, 127, 127));
     app.setPalette(p);
 
-    QString cfgPath = QCoreApplication::applicationDirPath() + "/chatgui.cfg";
+    QString cfgDir = QCoreApplication::applicationDirPath();
+    QString cfgPath = cfgDir + "/vibechat.cfg";
+    /* миграция: старый конфиг chatgui.cfg → vibechat.cfg */
+    if (!QFile::exists(cfgPath) && QFile::exists(cfgDir + "/chatgui.cfg"))
+        QFile::rename(cfgDir + "/chatgui.cfg", cfgPath);
 
     NodeConfig cfg(cfgPath);
     bool needSave = false;
 
     if (!cfg.exists()) {
-        if (!cfg.create("chatgui", 1333)) {
+        if (!cfg.create("", 1333)) {
             qCritical("Failed to create config: %s", qPrintable(cfgPath));
             return 1;
         }