feat(arch): Add armv8i (32-bit ARM/AArch32) architecture & complete TUI configurator

- Support ARMv8i / ARM32 (AArch32) baremetal target with arm-linux-gnueabihf toolchain
- Implement ARMv8i boot entry point, banked exception mode stacks (IRQ, ABT, UND, SVC)
- Implement 8 exception vectors, GICv2 distributor/CPU interface, CP15 Generic Timer (100 Hz), flat Section MMU
- Support PL011 UART for early console & interactive LazyBox TTY input
- Update Makefile with make armv8i_defconfig and automated cross-compilation
- Update scripts/kconfig/menuconfig.py with dedicated armv8i options

drivers/char/keyboard.c

@@ -125,10 +125,12 @@ void keyboard_init(void) {
 
 #if defined(__aarch64__)
 #include <arch/aarch64/uart.h>
+#elif defined(__arm__) || defined(__armv8i__)
+#include <arch/armv8i/uart.h>
 #endif
 
 bool keyboard_has_key(void) {
-#if defined(__aarch64__)
+#if defined(__aarch64__) || defined(__arm__) || defined(__armv8i__)
     if (uart_pl011_has_data()) return true;
 #endif
     return buffer_head != buffer_tail;
@@ -138,7 +140,7 @@ uint16_t keyboard_get_key(void) {
     while (!keyboard_has_key()) {
         arch_halt();
     }
-#if defined(__aarch64__)
+#if defined(__aarch64__) || defined(__arm__) || defined(__armv8i__)
     if (uart_pl011_has_data()) {
         char c = uart_pl011_getc();
         if (c == '\r') c = '\n';