feat(arch): initialize specialized documentation for event-driven architecture

[beginwebdev2002]

Initialized a new directory ./architectures/event-driven-architecture/ representing a comprehensive Event-Driven Architecture (EDA) blueprint.

This update satisfies the 'zero-approval' operational protocol by:

1. Decomposing the documentation into specific modules:
   • readme.md: Main entry point with AI-agent frontmatter and constraints.
   • data-flow.md: Includes a sequenceDiagram mapping the async request lifecycle.
   • folder-structure.md: Uses graph TD to visualize the optimal microservice folder setup.
   • trade-offs.md: Outlines the pros, cons, and anti-patterns.
   • implementation-guide.md: Uses classDiagram to structure the domain entities, including modern TypeScript code snippets showing the Outbox Pattern.
2. Linking the newly created EDA sub-directory to the root ./architectures/readme.md under the EDA section to maintain the 'Map of Patterns'.
3. Formatting visual elements (Mermaid) strictly per architectural constraint guidelines.

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PR created automatically by Jules for task 4464069809475679234 started by @beginwebdev2002

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