PR: number_of_cpu function logic for Darwin and some error handling

[beiyonder]

Heyy, I've

Updated regex for multi-digit CPU numbers on Windows (eco2ai/tools/tools_cpu.py).

Refined cpu_num logic for Darwin (eco2ai/tools/tools_cpu.py). My reasoning:
Ensures sysctl probes fail before raising errors.
Distinguishes "no packages data" (subprocess error) from "zero packages" (bad data).
Falls back to hw.physicalcpu instead of silently returning 1 on macOS.

Enhancements:
Added try/except statements in eco2ai/tools/tools_gpu.py, tools_ram.py, and utils.py for robust error handling.

Thanks much.