Add video walkthrough for AI Gateway capabilities via APIOps CLI

## Summary

Create and embed a video in the documentation that shows users how to leverage the AI Gateway capabilities of Azure API Management through APIOps CLI.

## Proposed Content

The video should demonstrate:

1. **Overview** — What APIM's AI Gateway capabilities are and why they matter
2. **MCP Server APIs** — How to extract, configure, and publish MCP (Model Context Protocol) server APIs through APIOps CLI
3. **A2A Communication** — How to manage Agent-to-Agent (A2A) APIs, including JSON-RPC endpoints and agent card configuration
4. **End-to-End Workflow** — Full extract → modify → publish cycle for AI Gateway APIs
5. **Configuration** — Any AI Gateway-specific configuration options (filters, overrides)
6. **Best Practices** — Tips for managing AI Gateway APIs at scale across environments

## Acceptance Criteria

- [ ] Video is recorded and published
- [ ] Video is embedded/linked in the documentation
- [ ] Documentation page provides supplementary written guidance alongside the video
- [ ] Covers both MCP Server and A2A API types