feat(arch): initialize specialized documentation for micro-frontends

[beginwebdev2002]

• Created directory architectures/micro-frontends/.
• Created readme.md, data-flow.md, folder-structure.md, trade-offs.md, and implementation-guide.md with required SEO YAML Frontmatter.
• Implemented the deterministic 4-step cycle (❌ Bad Practice, ⚠️ Problem, ✅ Best Practice, 🚀 Solution) in the documentation.
• Included Agent-Readable constraints and proper Mermaid diagrams.
• Appended ### 11. Micro-frontends to the Map of Patterns list in architectures/readme.md.

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PR created automatically by Jules for task 6096092682390014863 started by @beginwebdev2002

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