Add Agent QA to AI extension tools

[pranshuchittora]

Summary

• add Agent QA to the Chinese AI extension-tools section after Playwright
• describe its task-based web/mobile application QA through CLI and MCP
• state the current source-available license, delayed Apache conversion, and possible provider costs in the visible entry

Validation

• the canonical repository link returns HTTP 200
• the focused README change passes git diff --check
• the entry does not describe Agent QA as an autonomous agent or OSI-open-source project

Disclosure

I am affiliated with Agent QA and Vostride.

Agent QA's current release is source-available under FSL-1.1-ALv2, not OSI-approved open source; each release converts to Apache-2.0 two years after publication.

Agent QA itself can be used without a package fee, but separate model, browser, or device providers may charge for their services.