docs(contracts-sui): embed published video on dApp 1 page

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: stevep0z

content/contracts-sui/1.x/learn/dapp-1-marketplace.mdx

@@ -14,18 +14,11 @@ This page is one of three places to learn the marketplace. Pick the one that mat
 
 - **[GitHub repository](https://github.com/OpenZeppelin/openzeppelin-sui-marketplace)** — clone-and-run source. The README walks through localnet and testnet quickstarts, configuration, and the bootstrap scripts. Start here if you want to actually run the code.
 - **[In-repo walkthrough](https://github.com/OpenZeppelin/openzeppelin-sui-marketplace/tree/main/docs)** — a 23-chapter linear path inside the repo's `docs/` folder. Covers mental model, contracts, oracle integration, UI flows, testing, security, and troubleshooting. Reach for this when you want to understand how a particular subsystem works.
-- **Video walkthrough** — embedded below. ~18 minutes covering architecture, code, and a live transaction flow on testnet.
+- **[Video walkthrough](https://youtu.be/n53w3IGLnf8)** — embedded below. ~18 minutes covering architecture, code, and a live transaction flow on testnet.
 
 ## Video walkthrough
 
-<Callout type="info">
-The companion video walkthrough — *Sui Marketplace Fullstack Example: Move, Pyth, and OpenZeppelin Math Libraries* — will be embedded here once published. It covers the architecture, code, and a live transaction flow on testnet in approximately 18 minutes.
-</Callout>
-
-{/* TODO: when the video is published, replace `TBD_VIDEO_ID` with the YouTube video ID and uncomment the iframe below.
-
-<iframe width="100%" height="450" src="https://www.youtube.com/embed/TBD_VIDEO_ID" title="Sui Marketplace Fullstack Example: Move, Pyth, and OpenZeppelin Math Libraries" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
-*/}
+<iframe width="100%" height="450" src="https://www.youtube.com/embed/n53w3IGLnf8" title="Sui Marketplace Fullstack Example: Move, Pyth, and OpenZeppelin Math Libraries" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
 
 ## Architecture
 
@@ -121,7 +114,7 @@ Broader references:
 
 - **Read and run the repo.** Start with the [README](https://github.com/OpenZeppelin/openzeppelin-sui-marketplace) and follow either the localnet or testnet quickstart.
 - **Inspect the Move source.** The five modules in `oracle-market/sources/` are short enough to read in one sitting. Each pattern in the table above maps to a specific file and line range.
-- **Watch the video walkthrough.** Embedded above once published — covers the architecture, code, and a live transaction flow on testnet.
+- **[Watch the video walkthrough.](https://youtu.be/n53w3IGLnf8)** Embedded above — covers the architecture, code, and a live transaction flow on testnet.
 - **Fork it.** The repo is meant to be a starting point. Fork, strip out what you don't need, and adapt the patterns to your own protocol.
 
 For questions or feedback, open an issue on the [GitHub repository](https://github.com/OpenZeppelin/openzeppelin-sui-marketplace/issues) or the [OpenZeppelin contracts-sui repo](https://github.com/OpenZeppelin/contracts-sui).