fix: save/restore EFLAGS in context_switch instead of forcing sti after schedule()

fix: save/restore EFLAGS in context_switch instead of forcing sti after schedule()

context_switch now uses pushf/popf to properly save and restore the
EFLAGS register (including the IF bit) across context switches.
This replaces the unconditional hal_cpu_enable_interrupts() call
after context_switch in schedule(), which broke the interrupt-state
semantics for callers that needed atomicity.

All process creation functions (fork, clone, kernel thread) now push
EFLAGS=0x202 (IF=1) onto the initial stack so new processes start
with interrupts enabled via popf in context_switch.