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/labyrinth/index.html

@@ -22,7 +22,7 @@
 
 Players move around the shifting paths of the labyrinth in a race to collect various treasures. Whoever collects all of his treasures first and returns to his home space wins!
 
-Labyrinth is simple at first glance and an excellent puzzle-solving game for children; it can also be played by adults using more strategy and more of a cutthroat approach.</div>
+Labyrinth is simple at first glance and an excellent puzzle-solving game for children; it can also be played by adults using more strategy and more of a cutthroat approach.</div><div class="card"><div class="factrow"><b>where it lives</b> Library Kallax · C3</div></div>
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   <p>The Game Shelves · cataloged from shelf photos by