b9577

server: log prompts to directory (#22031)

• server: log prompts to directory

Add --log-prompts-dir to write each prompt to a separate text file in
the specified directory.

• Apply suggestion from @ngxson

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Co-authored-by: Xuan-Son Nguyen [email protected]

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• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
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Linux:

• Ubuntu x64 (CPU)
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• Ubuntu arm64 (Vulkan)
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UI:

• UI