Add live demo section and cover image

Add a 'Live Demo' section to the ABP Studio AI Agent announcement that embeds a thumbnail linking to the community talk YouTube video and includes an 'Also see' link to the AI Agent page. Also add the cover image asset (community-talk-cover-image.png) used by the embedded link.

docs/en/Community-Articles/2026-05-12-Introducing-Abp-Studio-Ai-Agent/abp-studio-ai-announcement.md

@@ -224,3 +224,13 @@ This release is the first step. The features below are already on our short-term
 - **Design helper**: ABP Agent will generate images.
 - **Create a new project with the agent**: an AI-driven solution creation flow where you describe the application you want and ABP Agent helps choose the right template, modules, and configuration.
 - **ABP Suite integration**: ABP Agent will be able to invoke ABP Suite for CRUD-page generation. Instead of asking the LLM to write the full set of layers for a CRUD page (which spends a lot of tokens and time), the agent will hand the task to ABP Suite, get a deterministic, production-quality result back, and continue with the parts that actually need the AI.
+
+## Live Demo
+
+We have previewed the ABP Agent in our latest community talk. Click to watch it:
+
+[![community-talk-cover-imageAlt text](community-talk-cover-image.png)](https://www.youtube.com/watch?v=GYVFn2lRuWw)
+
+### Also see
+
+* https://abp.io/studio/ai-agent