fix: fix local proxy settings and restart logic

- Added local proxy restart token management in Settings.
- Implemented logic to handle local proxy state on application quit.
- Updated ProxyServer to restart based on configuration changes.
- Enhanced API configuration updates to bump restart token when necessary.
- Improved UI components to reflect local proxy availability and state.
- Added new error handling and notifications for local proxy operations.

client/core/local-proxy/proxyserver.cpp

@@ -8,6 +8,7 @@ ProxyServer::ProxyServer(const std::shared_ptr<Settings> &settings, QObject *par
     , m_settings(settings)
     , m_service(new ProxyService(settings, this))
 {
+    m_lastRestartToken = m_settings ? m_settings->localProxyRestartToken() : 0;
 }
 
 ProxyServer::~ProxyServer()
@@ -73,6 +74,7 @@ bool ProxyServer::syncSettings()
     }
 
     const quint16 newProxyPort = m_settings ? m_settings->localProxyPort() : 0;
+    const int restartToken = m_settings ? m_settings->localProxyRestartToken() : 0;
     const bool xrayRunning = m_service->isXrayRunning();
 
     if (!xrayRunning) {
@@ -80,15 +82,27 @@ bool ProxyServer::syncSettings()
         const bool started = startXrayProcess();
         if (started) {
             m_currentProxyPort = newProxyPort;
+            m_lastRestartToken = restartToken;
         }
         return started;
     }
 
+    if (m_lastRestartToken != restartToken) {
+        qInfo() << "Local proxy: restarting Xray due to config change token";
+        const bool restarted = m_service->restartXray();
+        if (restarted) {
+            m_currentProxyPort = newProxyPort;
+            m_lastRestartToken = restartToken;
+        }
+        return restarted;
+    }
+
     if (m_currentProxyPort != newProxyPort) {
         qInfo() << "Local proxy: proxy port changed from" << m_currentProxyPort << "to" << newProxyPort;
         const bool restarted = m_service->restartXray();
         if (restarted) {
             m_currentProxyPort = newProxyPort;
+            m_lastRestartToken = restartToken;
         }
         return restarted;
     }

client/core/local-proxy/proxyserver.h

@@ -32,4 +32,5 @@ private:
     bool m_isRunning {false};
     quint16 m_currentApiPort {0};
     quint16 m_currentProxyPort {0};
+    int m_lastRestartToken {0};
 };