Add themed board game library at /mygames/

Embed the bggpipe "Game Shelves" export (static/games/) into a themed
Hugo page. A small loader (embed.js) fetches each export page, lifts out
its <main>, rewrites relative URLs, and rewires game links to ?g=<slug>
so the blog chrome stays on every page; embed.css scopes the export's
component styling to the embed. The export itself is untouched and stays
re-exportable. Adds the menu entry and excludes badges/ from deploy.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

content/mygames.md

@@ -0,0 +1,12 @@
+---
+title:
+description: My board game library, cataloged from shelf photos — search it, browse it, dig into any title.
+---
+
+Welcome to my board game library. It's [cataloged straight from photos of my shelves](https://git.kestrelsnest.social/eric/bggpipe), pulling details and cover art from BoardGameGeek. Search the collection below, or click any game to see the full rundown.
+
+{{< rawhtml >}}
+<link rel="stylesheet" href="/games/embed.css">
+<div id="games-embed"><p>Loading the shelves…</p></div>
+<script src="/games/embed.js" defer></script>
+{{< /rawhtml >}}