Plasma rotation reversal and magnetic collapse (major disruption) remain the central obstacles to steady-state operation in tokamak magnetic-confinement fusion devices. This paper takes as its foundational pillar the rigorous mathematical proof published in Forum of Mathematics, Pi (2025) by Wei Dongyi, Zhang Zhifei, and Shao Feng, establishing the finite-time blow-up of solutions to the supercritical defocusing nonlinear wave equation. This result is systematically coupled with the physical framework of the Spatial-Temporal Ladder Theory (STLT) concerning dark-matter polarisation, and with the Q-field (aether induction intensity) mechanism proposed in the Zenodo document (DOI: 10.5281/zenodo.20500774), to construct a complete explanatory chain running from a pure mathematical theorem through plasma-physics mechanism to engineering control strategy. Rotation reversal is interpreted as the macroscopic fingerprint of the self-similar contraction-solution stage; magnetic collapse is interpreted as the real-world echo of the finite-time blow-up solution. We further identify a profound numerical resonance between the critical nonlinear-index threshold of Wei's proof (p >= 17 for d >= 5; p >= 29 for d = 4) and the 18-dimensional "Shen" spacetime of STLT. We explicitly acknowledge that this cross-theoretical mapping currently constitutes a heuristic framework rather than a chain of strict derivations. Its value lies not in claiming to have unveiled the truth, but in several key structural correspondences and self-consistencies that render the integrated framework worthy of serious investigation. On this basis, we propose an engineering blueprint for achieving "fusion success" -- going beyond mere thermonuclear ignition to reach Q > 5 net energy gain and long-duration steady-state operation -- through active modulation of the Q-field to suppress the self-similar implosion skeleton. A theoretical outlook on low-energy assisted fusion is also provided.