feat: Implement modern Tree directory visualizer, TSC profiler, and VT Art visualizer

- Add dedicated Linux-compatible Tree visualizer with UTF-8/ASCII branch tracking, -L depth filtering, human sizes, and permissions in userland/lazybox/tree.c
- Implement Hardware Invariant Timestamp Counter (TSC) calibration and microsecond delay timer in kernel/tsc.c and include/kernel/tsc.h
- Add Virtual Terminal color palette, live resource utilization bars, and logo banner in kernel/vt_art.c and include/kernel/vt_art.h
- Add LazyBox applets: 'tree', 'tscinfo', and 'vtart'
- Update README.md documentation and command matrix

Makefile

@@ -124,7 +124,8 @@ endif
 CORE_SRCS = kernel/main.c kernel/task.c kernel/sync.c kernel/timer.c kernel/printk.c \
             kernel/panic.c kernel/trace.c kernel/sched.c kernel/cron.c kernel/syscall.c \
             kernel/syslog.c kernel/module.c kernel/kobject.c kernel/metrics.c kernel/namespace.c \
-            kernel/signal.c kernel/workqueue.c kernel/sub/sub_runtime.c kernel/sub/sub_vm.c \
+            kernel/signal.c kernel/workqueue.c kernel/tsc.c kernel/vt_art.c \
+            kernel/sub/sub_runtime.c kernel/sub/sub_vm.c \
             lib/string.c lib/vsprintf.c lib/bitmap.c \
             init/cmdline.c init/service.c usr/initramfs.c block/block.c block/elevator.c \
             ipc/sem.c ipc/shm.c ipc/shm_posix.c ipc/pipe.c ipc/ipc.c ipc/msg.c \
@@ -277,7 +278,7 @@ CONFIG_SRCS-y += drivers/char/tty.c drivers/char/keyboard.c drivers/char/serial.
 
 # Userland
 ifeq ($(CONFIG_USERLAND_LAZYBOX), y)
-    CONFIG_SRCS-y += userland/lazybox/lazybox.c userland/lazybox/shell.c userland/lazybox/sh.c userland/lazybox/nano.c userland/lazybox/snake.c
+    CONFIG_SRCS-y += userland/lazybox/lazybox.c userland/lazybox/shell.c userland/lazybox/sh.c userland/lazybox/nano.c userland/lazybox/snake.c userland/lazybox/tree.c
 endif
 
 # Deduplicate