fix: cmdline parsing, framebuffer fallback, UART serial input for TTY

fix: cmdline parsing, framebuffer fallback, UART serial input for TTY

1. cmdline: use separate tok_copy buffer for tokenization so token
   pointers are properly null-terminated; raw_copy stays pristine
   for /proc/cmdline.

2. framebuffer: remove Multiboot2 framebuffer request tag from boot.S
   so GRUB keeps EGA text mode (no pixel drawing routines yet).

3. serial input: enable UART RX interrupt (IER bit 0), route IRQ 4
   (COM1) via IOAPIC to IDT vector 36, wire hal_uart_set_rx_callback
   to tty_input_char in tty_init(). /bin/sh now accepts serial input.

4. grub.cfg: add shell entry (init=/bin/sh), keep ring3 test with
   console=serial for smoke test performance.

Tests: 20/20 smoke, cppcheck clean.