v2.8.1

This release improves the stability of the subtitle generation pipeline by relaxing the timestamp validation constraints.

Fixes & Improvements:

• Increased Validation Buffer: Adjusted the default validation_buffer_ms from 1000ms to 2000ms in AiSettings. This provides additional headroom for AI models that frequently generate timestamps slightly exceeding the actual video segment duration, significantly reducing false-positive validation failures and redundant job retries.