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

include/arch/armv8i/cpu.h

@@ -0,0 +1,21 @@
+#ifndef _ARCH_ARMV8I_CPU_H
+#define _ARCH_ARMV8I_CPU_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct {
+    uint32_t midr;
+    uint32_t mpidr;
+    uint32_t implementer;
+    uint32_t part_number;
+    uint32_t architecture;
+    char model_name[64];
+} armv8i_cpu_info_t;
+
+void armv8i_cpu_init(void);
+const armv8i_cpu_info_t* armv8i_get_cpu_info(void);
+uint32_t armv8i_get_midr(void);
+uint32_t armv8i_get_mpidr(void);
+
+#endif // _ARCH_ARMV8I_CPU_H