fix: set CPU affinity for trigger thread

[0x126]

PR Type

• Improvement

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Description

This PR adds CPU affinity setting for trigger_thread_ to improve timing consistency of the FSYNC signal. Previously, CPU affinity was only applied to the main thread, and the trigger thread could migrate across CPUs, causing jitter.
By pinning the trigger thread to a dedicated CPU core, FSYNC timing stability is improved.

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