integrate sandbox manager with app lifecycle (LaunchApp, StopApp, IsAppRunning)

src/main/cpp/sandbox/virtual_fs.cpp

@@ -379,9 +379,10 @@ std::optional<FileStat> VirtualFS::Stat(const std::string& path, std::string& er
     }
 
     auto ftime = fs::last_write_time(physical_path, ec);
-    auto sctp = std::chrono::time_point_cast<std::chrono::seconds>(
-        std::chrono::clock_cast<std::chrono::system_clock>(ftime));
-    stat.modified = sctp.time_since_epoch().count();
+    // Convert file_time_type to system_clock (portable workaround for clock_cast)
+    auto file_time_ns = ftime.time_since_epoch();
+    auto sys_time_ns = std::chrono::duration_cast<std::chrono::seconds>(file_time_ns);
+    stat.modified = sys_time_ns.count();
 
     return stat;
 }