Rewrite README with architecture diagrams and OIF documentation

[0xjim]

Summary

• Rewrites the README to serve as a proper technical reference for the protocol, covering architecture, settler implementations, oracle integrations, solver selection mechanics, and the governance fee model
• Adds ASCII architecture diagram and sequence flow diagram showing the full cross-chain settlement lifecycle
• Incorporates OIF standard terminology and dictionary for consistent language across the ecosystem

Test plan

• Verify README renders correctly on GitHub (ASCII diagrams inside code blocks, tables, links)
• Confirm all external links resolve (OIF repo, OIF solvers repo, LI.FI docs, Resource Locks docs)
• Confirm deployed addresses match current production deployments

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