[$50 BOUNTY] [Python] Add cross-platform health check fallbacks

[liujin11112]

Summary

Adds cross-platform fallbacks for check_memory_usage() and check_load_average() so non-Linux environments report useful diagnostic values instead of generic /proc read failures.

Changes

• tools/health_check.py:
  • check_memory_usage(): Keeps Linux /proc/meminfo path; adds macOS fallback via vm_stat+sysctl; adds Windows fallback via GlobalMemoryStatusEx
  • check_load_average(): Keeps Linux /proc/loadavg path; adds macOS/Unix fallback via os.getloadavg(); returns informative WARNING on Windows
• tests/test_health_check.py: 9 unit tests covering cross-platform memory and load fallback behavior

Testing

python -m unittest tests.test_health_check -v
# Result: 9/9 tests passed

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR

[liujin11112]

Hi, this PR adds cross-platform fallbacks for memory and load checks on macOS and Windows while keeping Linux behavior unchanged.

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[liujin11112]

Hi, just checking in on this PR. Is there anything else needed from my side to move this forward? The code changes + tests are ready. Happy to make any adjustments. Thanks!