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

arch/armv8i/cpu/cpu.c

@@ -0,0 +1,41 @@
+#include <arch/armv8i/cpu.h>
+#include <lib/string.h>
+#include <kernel/printk.h>
+
+static armv8i_cpu_info_t global_cpu_info;
+
+uint32_t armv8i_get_midr(void) {
+    uint32_t midr;
+    __asm__ volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(midr));
+    return midr;
+}
+
+uint32_t armv8i_get_mpidr(void) {
+    uint32_t mpidr;
+    __asm__ volatile("mrc p15, 0, %0, c0, c0, 5" : "=r"(mpidr));
+    return mpidr;
+}
+
+void armv8i_cpu_init(void) {
+    memset(&global_cpu_info, 0, sizeof(global_cpu_info));
+    global_cpu_info.midr = armv8i_get_midr();
+    global_cpu_info.mpidr = armv8i_get_mpidr();
+    global_cpu_info.implementer = (global_cpu_info.midr >> 24) & 0xFF;
+    global_cpu_info.part_number = (global_cpu_info.midr >> 4) & 0xFFF;
+    global_cpu_info.architecture = (global_cpu_info.midr >> 16) & 0xF;
+
+    const char* part_str = "ARM Cortex-A (ARMv8i 32-Bit)";
+    if (global_cpu_info.part_number == 0xC0F) part_str = "ARM Cortex-A15 (ARMv7-A/v8i)";
+    else if (global_cpu_info.part_number == 0xC07) part_str = "ARM Cortex-A7 (ARMv7-A/v8i)";
+    else if (global_cpu_info.part_number == 0xD03) part_str = "ARM Cortex-A53 (AArch32)";
+    else if (global_cpu_info.part_number == 0xD07) part_str = "ARM Cortex-A57 (AArch32)";
+
+    strncpy(global_cpu_info.model_name, part_str, sizeof(global_cpu_info.model_name) - 1);
+
+    printk(KERN_INFO "CPU: %s (Implementer: 0x%02x, Part: 0x%03x, AArch32)\n",
+           global_cpu_info.model_name, global_cpu_info.implementer, global_cpu_info.part_number);
+}
+
+const armv8i_cpu_info_t* armv8i_get_cpu_info(void) {
+    return &global_cpu_info;
+}