Feature: Add "Full Disk Access" permission check for macOS client

macos/main.mm

@@ -496,6 +496,12 @@ int main(int argc, const char* argv[])
             Permissions::requestAccessibility();
         }
 
+        if (!Permissions::checkFullDiskAccess()) {
+            NSLog(@"Full Disk Access permission not granted.");
+            NSLog(@"Please grant permission in System Preferences > Privacy & Security > Full Disk Access");
+            Permissions::openFullDiskAccessSettings();
+        }
+
         // Create client
         auto ClientObject = std::make_unique<IOCPClient>(g_bExit, false);
         ClientObject->setManagerCallBack(NULL, DataProcess, NULL);