games: the ladder gets played, and the rack learns where to stand

Trivia had every Go test passing and had never been in a browser, which
this plan's own rule says means nothing. So: play it.

The game itself holds up. The clock drains honestly and does not restart
on a reload, the multiple compounds, walking pays exactly what the felt
quoted, the reveal marks the right answer, and the auto-submit at zero
lands as a timeout rather than an illegal move. The next question's
answer never crosses the wire.

Two bugs only the browser could show:

- The spot printed double the stake after every settled game. standing()
  set spot.amount and *then* poured the chips on, and pour grows the pile
  from what it is told is already there. The money was always right; the
  number under the chips was not, which is the one rule the felt is built
  on.

- The house rack sat on top of the multiplier at 390px. Its 5.75rem inset
  is not a margin, it is the width of blackjack's shoe — so on a phone the
  rack sits in the middle of the felt. It now shrinks on small screens and
  pulls into the corner where the corner is empty; data-at says which rack
  is which, because pulling blackjack's to the edge slides it under the
  deck.

The dev rig seeds its own question bank now (one real OpenTDB batch per
difficulty), because a fresh dev database 503s every start otherwise.

internal/web/templates/blackjack.html

@@ -23,7 +23,7 @@
        always travelling between one of those and the spot in front of you. -->
   <section class="pete-felt relative overflow-hidden rounded-3xl p-6 sm:p-10 shadow-pete-lg border-2 border-[color:var(--ink)]/10">
 
-    <div class="pete-rack" data-house aria-hidden="true">
+    <div class="pete-rack" data-at="shoe" data-house aria-hidden="true">
       <span data-chip="500" style="--stack: 5"></span>
       <span data-chip="100" style="--stack: 7"></span>
       <span data-chip="25"  style="--stack: 4"></span>