Add Frontend UX Study Requirements

[jmbish04]

This commit adds a comprehensive frontend_ux_study.md document outlining the UX research and design requirements for the frontend interface of the Cloudflare Worker GitHub Proxy. The requirements are based on an analysis of the existing backend capabilities (Flows API, Tools API, generic proxies, and Agentic Orchestration). It covers target audiences, core objectives, detailed user journeys (Agentic Research Console, Repository Flow Wizard, API Playground), UI/UX component specifications, success metrics, and strict adherence to the defined global error handling protocol.

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PR created automatically by Jules for task 6729914817211005112 started by @jmbish04

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Code Review

This pull request introduces a comprehensive UX study document for the Cloudflare Worker GitHub Proxy frontend, outlining key user journeys such as the Agentic Research Console, Repository Flow Wizard, and API Playground. The documentation also defines critical UI components and a strict error handling protocol. Review feedback suggests standardizing the terminology for error notification buttons to 'Copy for AI' to ensure consistency with the existing implementation and within the document itself.