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

Makefile

@@ -293,7 +293,7 @@ ifeq ($(ARCH), x86_64)
                -mcmodel=kernel -Wall -Wextra -Wno-unused-function -Wno-unused-parameter \
                $(if $(CONFIG_OPTIMIZATION),$(CONFIG_OPTIMIZATION),-O2) -Iinclude -D__x86_64__ \
                -std=c++17 -fno-exceptions -fno-rtti -fno-threadsafe-statics -fno-use-cxa-atexit
-    CPP_SRCS = kernel/cpp/cxx_runtime.cpp kernel/cpp/cpp_module.cpp
+    CPP_SRCS = $(shell find kernel/cpp -name '*.cpp' 2>/dev/null)
     CPP_OBJS = $(patsubst %.cpp, $(BUILD_DIR)/%.o, $(CPP_SRCS))
     ALL_C_SRCS = $(ARCH_C_SRCS) $(CONFIG_SRCS-y)
     C_OBJS = $(patsubst %.c, $(BUILD_DIR)/%.o, $(ALL_C_SRCS))