feat: 真实数据时间对齐集成测试框架

- tests/realdata_contract.py:数据契约底座(SRT 解析/清洗、时间对齐量化
  指标 align_report、幻觉词/专名判定、提示词规则拼接)
- tests/test_integration_alignment.py:流水线产物 vs 硬字幕参考的时间对齐
  (真实数据复现"字幕过早/过晚",红→绿闭环)
- tests/test_integration_prompt_rules.py:寒暄幻觉/专名提示词规则测试
- scripts/extract_reference_srt.py:从烧录字幕视频自动提取参考时间轴
- testdata/REALDATA_README.md + alignment/*.reference.srt:真实参考字幕
  (视频素材较大,gitignore 不入库)
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