feat: Expand C++17 kernel subsystem with OOP device framework, containers, and benchmark engine

- Implement modern freestanding C++17 containers (Vector<T>, UniquePtr<T>, String) in kernel/cpp/cpp_containers.hpp
- Implement object-oriented Device driver model (Device, BlockDevice, CharDevice, VirtualRamDiskDevice, VirtualNullDevice, VirtualZeroDevice, DeviceManager) in kernel/cpp/cpp_device.hpp and kernel/cpp/cpp_device.cpp
- Add C++ kernel performance microbenchmark suite in kernel/cpp/cpp_bench.cpp
- Export C-FFI bridges and add cross-architecture fallbacks in kernel/cpp/cpp_fallback.c and include/kernel/cpp_kernel.h
- Add LazyBox applets: 'cppdevs' and 'cppbench'
- Update README.md documentation and command matrix

include/kernel/cpp_kernel.h

@@ -18,6 +18,13 @@ void cpp_kernel_print_status(void);
 // Run C++ OOP Virtual Dispatch and Template Test
 int cpp_test_oop_subsystem(void);
 
+// C++ Object-Oriented Device Management
+void cpp_device_init_all(void);
+void cpp_device_dump(void);
+
+// C++ Kernel Performance Benchmarks
+int cpp_run_benchmarks(void);
+
 #ifdef __cplusplus
 }
 #endif