docs: add API endpoint documentation

[jayati04]

Summary

This PR adds API endpoint documentation to the README.

Changes

• Added authentication endpoint documentation
• Added activity management endpoint documentation
• Added dashboard endpoint documentation

Motivation

The backend exposes several API routes through the Cloudflare Worker, but these routes were not documented in the README. This change improves onboarding for contributors and developers by providing a quick reference for commonly used endpoints.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 997b01e and 838843e.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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