We present a comprehensive paradigm within Spacetime Substantivalism, wherein spacetime is a physical entity endowed with intrinsic mechanical properties: a characteristic scale D approx 2.35 kpc and an ultimate tensile strength sigma_max. Within this framework, a black hole is fundamentally reinterpreted as a macroscopic structural fracture of spacetime, occurring when local gravitational stress exceeds sigma_max. This fracture naturally eliminates singularities and resolves the information paradox by encoding infalling data on the fracture edge. The theory offers a unified explanation for galactic rotation curves (e.g., NGC 2403, M33) and the cosmological Omega_DM/Omega_b ratio, providing testable predictions for gravitational wave echoes and black hole shadows. [Relationship to the CSSD Framework] Consistency with Cs: The ultimate tensile strength (sigma_max) introduced here is the static mechanical manifestation of the characteristic speed of gravity (Cs) established in our previous work (Spacetime Substantivalism I). Scale Integrity: This work maintains full logical consistency with the D approx 2.35 kpc transition scale, completing the bridge from galactic dynamics to strong-field structural failure (black holes). 【中文摘要】 本文在“时空实体论”框架下提出了一个完整的物理范式。时空被视为具有内在力学属性的物理实体,拥有特征尺度 D 约为 2.35 kpc 和极限抗张强度 sigma_max。黑洞被重新诠释为时空实体的宏观结构断裂,发生在局部引力应力超过 sigma_max 时。这一模型自然消除了物理奇点,并通过断裂边缘的信息编码解决了信息佯谬。该理论统一解释了星系旋转曲线(如 NGC 2403, M33)及宇宙学暗物质比例,并为引力波回声和黑洞照片阴影提供了可验证的预测。