Add opt-in KSwitcher LAN discovery and mutual code pairing preview

src/app.h

@@ -4,6 +4,7 @@
 #include "update.h"
 #include "sync.h"
 #include "chat_context.h"
+#include "lan.h"
 #include <atomic>
 #include <condition_variable>
 #include <deque>
@@ -92,6 +93,7 @@ class App
     void checkUpdate(bool interactive, bool install = false, const std::wstring &version = {});
     std::wstring syncCommand(int action = 0, const std::vector<SyncChoice> &choices = {});
     Bytes syncConflictData();
+    Bytes lanCommand(const Bytes &);
     void pollSync();
     static App *current;
 
@@ -99,6 +101,7 @@ class App
     friend struct InputRegressionAccess;
     void releaseIdleMemory(ULONGLONG now);
     HHOOK keyboardHook{}, mouseHook{};
+    std::unique_ptr<LanService> lanService;
     HANDLE historyProcess{};
     std::mutex jobsMutex;
     std::condition_variable jobsReady;