Add shelves page to game library; refresh bggpipe export

Port the export's physical shelf layout (.wall/.orow/.ocell) into the
scoped embed.css so /mygames/?g=shelves renders the wall in true
proportions, using the cream board color and accent-purple links for
legibility on the dark theme. Includes a fresh bggpipe re-export (new
Etherfields and Red Dragon Inn titles, updated art). embed.js/embed.css
are untouched by the export.

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

static/games/castle-panic/index.html

@@ -24,7 +24,7 @@ Castle Panic is a Fantasy themed, cooperative, light tactical wargame for 1 to 6
 
 First game in the Panic series.
 
-UPC 850680002005</div>
+UPC 850680002005</div><div class="card"><div class="factrow"><b>where it lives</b> Library Kallax · C1</div></div>
 <footer>
   <p><a class="pbb" href="https://boardgamegeek.com" rel="noopener"><img src="../art/powered-by-bgg.png" alt="Powered by BGG" height="40"></a></p>
   <p>The Game Shelves · cataloged from shelf photos by