fix: replace blocking requests calls with async aiohttp in agent handlers

[CodeBySayak]

Summary

Replaced blocking synchronous requests HTTP calls with async aiohttp in three agent examples. The requests library blocks the entire asyncio event loop while waiting for a network response, preventing agents from processing concurrent messages or maintaining protocol heartbeats. This fix ensures agents remain fully responsive during external API calls.

Type of Change

• New agent example
• Bug fix
• Documentation update
• Refactor / cleanup
• Other

Checklist

• I have starred this repository.
• I ran ruff check ..
• I ran ruff format ..
• I added/updated README.md for changed example(s).
• I added .env.example if environment variables are required.
• I added demo image/GIF (if applicable).
• I added agent profile link (if applicable).
• I updated CHANGELOG.md (required for non-doc changes).
• I verified paths/commands used in docs.

Related Issue

Link issue number(s), if any: #41

Notes for Reviewers

The logic and behaviour of all three agents is unchanged — only the HTTP transport layer was swapped from requests to aiohttp. The aiohttp dependency was already present in image-agent-payment-protocol/requirements.txt, so no new dependencies are introduced for that example. For web3/internet-computer/fetch/, a requirements.txt was added as the file was missing entirely. For Rag-agent/ango/agent.py, arun() is the officially supported async method in the Agno framework and is a drop-in replacement for run() in an async context.

[gautammanak1]

@leno23, please fix the CI check

[gautammanak1]

Thanks for the contribution 🚀

The CI for this PR is currently failing. Please fix the following so we can move forward:

• format — run ruff format . and commit the result
• lint — run ruff check . --fix and resolve remaining warnings
• typecheck — fix the reported type errors
• stargazer-gate — please ⭐ star this repository (the gate passes once you've starred)

Once the checks are green it'll be ready for maintainer review. Let me know if you need any help! 🙌