fix: fix uuid.h to work on macOS

[wgtmac]

Purpose

Currently src/paimon/common/utils/uuid.h blindly uses /proc/sys/kernel/random/uuid to generate uuid. This only works on Linux-based platforms. I just made it work on macOS.

Tests

N/A

API and Format

N/A

Documentation

N/A

Generative AI tooling

Generated-by: Codex with GPT-5.5

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Make UUID generation work on macOS by falling back to platform UUID APIs when Linux /proc UUID generation isn’t available.

Changes:

• Add Apple-specific includes for <uuid/uuid.h> and std::array.
• Add an __APPLE__ fallback path that generates a UUID via uuid_generate_random / uuid_unparse_lower.

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[lxy-9602]

+1

[lucasfang]

+1

[wgtmac]

Thank you, @lxy-9602 @lucasfang!