feat: add new models MFD-1.5 & MFR-1.5

Update 2025.07.25: V1.1.4 Released

Major Changes:

• Upgraded the Mathematical Formula Detection (MFD) and Mathematical Formula Recognition (MFR) models to version 1.5. All default configurations, documentation, and examples now use mfd-1.5 and mfr-1.5 as the standard models.

主要变更：

• 数学公式检测（MFD）和数学公式识别（MFR）模型升级到 1.5 版本，所有默认配置、文档和示例均以 mfd-1.5 和 mfr-1.5 为标准模型。