This study proposes a thermodynamic framework that unifies General Relativity (GR) and Quantum Field Theory (QFT) through a continuous energy-flow field parameterized by entropy S. The model introduces an entropy-dependent coupling and an emergent light speed, showing that both spacetime geometry and quantum fluctuations arise as limiting cases of the same non-equilibrium continuum.At low entropy, ordered energy flow reproduces GR-like curvature; at high entropy, the field behaves as a quantized, fluctuation-dominated regime consistent with QFT. Intermediate entropy supports resonant self-organization, linking cosmic structure formation and complex-system stability. Observational implications include entropy-driven explanations for the Hubble tension, halo rotation curves, and CMB anisotropies.The work builds on the author’s prior publications on the Energy-Flow Hypothesis, Grid-Higgs Framework, and CEM-Cosmos resonance model, all archived on Figshare. Together, these studies outline a coherent thermodynamic paradigm where geometry, fields, and information emerge from the same underlying process of energy redistribution through entropy gradients.