feat(ipc/sem): add semaphore support for dragonOS

[mistcoversmyeyes]

Related

• Closes feat(ipc): Implement System V semaphore syscalls on x86_64 #2142

Summary

• Implement the x86_64 System V semaphore syscalls: semget, semctl, semop, and semtimedop.
• Add semaphore-set management to IPC namespaces.
• Extract and reuse common System V IPC permission checks.

Scope

• Match the Linux 6.6 x86_64 ABI and observable behavior.
• SEM_UNDO is out of scope and currently returns ENOSYS.

Acceptance

• Valid semaphore syscall requests no longer return ENOSYS.
• semop and semtimedop share consistent operation semantics.
• Creation, lookup, control, removal, and permission checks match Linux behavior.
• Multi-operation requests execute atomically.
• Blocking operations wake correctly after value changes or IPC_RMID.
• Nonblocking, timeout, signal, invalid-argument, and removed-set errors match Linux behavior.
• Concurrent access avoids races, lost wake-ups, use-after-free, and resource leaks.
• Existing DragonOS CI tests pass.

Testing

• Added 43 System V semaphore dunitests.
• QEMU guest test: 43/43 passed.
• Format, Clippy, multi-architecture builds, Dunitest, and Integration Test CI passed.