Refactor CQRS, Clean, and Hexagonal Architecture documentation for Agent parsing

[beginwebdev2002]

• Refactored clean-architecture, cqrs, and hexagonal-architecture implementation guides.
• Standardized YAML metadata.
• Ensured a strict 4-step cycle (Bad Practice, Problem, Best Practice, Solution) blueprint is implemented for AI-Agent parsing.
• Added and optimized Mermaid classDiagram visualizations.

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PR created automatically by Jules for task 4470559425395302552 started by @beginwebdev2002

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