changelog: Teable Skill for AI Agents

[Jocky-Teable]

Changes

• Add the Jul 28, 2026 Teable Skill for AI Agents changelog in English and Chinese
• Add the compressed product demo video and VideoObject metadata
• Keep only the newest launch video on eager preload

Verification

• Verified local, LAN, and public previews
• Verified the changelog navigation and video rendering

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}