docs: add repository-driven architecture overview

[mahid797]

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[Copilot]

Pull Request Overview

This PR introduces a comprehensive architecture documentation file that describes the structure and data flow of the LangRoute system. The document provides detailed explanations of the repository-driven architecture, including component organization, request flows, and extensibility patterns.

• Adds a complete architecture overview document with 10 main sections covering system components, data flows, and conventions
• Documents the layered architecture from Web UI through API routes to services and data access
• Includes extensibility guidelines and security considerations for future development

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