Abstract: [Objective] This study aims to fundamentally resolve the paradigm conflict between relativity and quantum mechanics, reveal the essence of dark matter (dark energy, dark matter), and achieve the unification of the four fundamental forces. [Method] Departing from the traditional assumption that "dark matter is particles," this framework adopts the "one-dimensional twin" ontology, constructs a cosmic background entity—the Dark Matter Domain (DMD)—using "dragon particles" as fundamental components, and establishes its dynamic theoretical framework. [Results] The framework unifies gravity, electromagnetism, and the strong force through DMD's domain geometric deformation effects, domain stress, and distinct local excitation patterns, providing a parameter-free explanation for galactic rotation curves. Within this framework, black holes are redefined as key phases in cosmic cycles, with singularities serving as critical points where information paradoxes are inherently resolved. [Conclusion] This theory achieves the unification of the four fundamental forces through DMD's single physical mechanism, effectively incorporating known laws like general relativity and quantum mechanics as effective approximations that ignore secondary factors. Core predictive claim: The universality and observability of dark matter.

Important Notices; 1. **Terminology Correction** The core concept of "龙粒子" was mistranslated as "西昂粒子" in the PDF file of the previous versions (v1, v2). This is hereby corrected, and its official English term is **"Dragon Particles"**. This version (v3) updates the title to reflect this correction. 2. **Copyright Registration** This work was registered with the China Copyright Administration on September 8, 2025 (Registration Number: **国作登字-2025-A-00316350**). This preprint release is based on the aforementioned registered work.```