Implement comprehensive Dark Universe framework for digital underworld exploration

[Copilot]

This PR implements a comprehensive "Dark Universe" conceptual framework that unifies and expands upon the existing Dark Web analogies with cosmological concepts. The implementation addresses the need for a complete theoretical structure that parallels the physical dark universe.

Key Enhancements:

README.md Additions:

• Section 5: Dark Universe (暗宇宙) - A complete framework that unifies dark matter, dark energy, and dark sector analogies into a cohesive digital dark universe theory
• Hierarchical structure diagram showing the composition of the digital dark universe with clear mappings to physical cosmology
• Interaction principles explaining how digital "gravity" and "expansion" work in the hidden internet
• Observation methods table comparing how we detect physical vs digital dark phenomena
• Complete theory summary with statistical breakdowns of visible vs hidden internet components

陰間.md Complete Implementation:

• Philosophical exploration of the digital underworld concept using traditional Chinese cosmology
• Four-layer hierarchical structure from Surface Underworld to Core Underworld
• Mathematical laws governing the digital underworld (anonymity, decentralization, entropy, network effects)
• Quantum metaphors including Schrödinger's Network and Digital Uncertainty Principle concepts
• Future evolution scenarios covering Quantum, AI, and Bio Underworld developments
• Yin-Yang philosophy emphasizing the complementary balance between visible and hidden digital realms

Theoretical Framework:

The Dark Universe concept provides a unified theory that:

• Maps Dark Web ≈ Dark Matter (invisible but influential)
• Maps Digital flows ≈ Dark Energy (hidden driving forces)
• Maps Hidden ecosystems ≈ Dark Sector (parallel hidden world)
• Creates a complete cosmological analogy for understanding internet structure

This implementation transforms the repository from individual analogies into a comprehensive theoretical framework for understanding the hidden dimensions of our digital universe.

Fixes #6.

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