Harden NUMA affinity node validation and sparse CPU mapping

[yunuservices]

This PR fixes two NUMA-related correctness issues:

• Prevents null-driven failures when setting NUMA affinity with invalid node ids.
• Fixes sparse CPU-to-NUMA mapping behavior so unknown/unmapped cores are not implicitly treated as node 0.

Problem

• OSNuma#setCurrentNumaAffinity(int[]) could fail with a null path when getCores(node) returned null.
• LinuxNuma core mapping initialization could leave gaps that defaulted to 0, causing incorrect NUMA locality assumptions on some topologies.

Changes

• OSNuma.java
  • Added validation in setCurrentNumaAffinity(int[]).
  • Throws IllegalArgumentException for unknown NUMA nodes instead of allowing a null path.
  • Hardened PreCalculatedNuma handling for unknown mappings.
• LinuxNuma.java
  • Reworked static initialization flow for safer instance construction.
  • Initializes coreToNuma deterministically and treats unknown entries explicitly.
  • Keeps mapping consistent for sparse/non-contiguous CPU ids.