feat(tarot): 히어로 영상 + 배경 + 카드 뒷면 SVG (T7)

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

public/images/tarot/card_back.svg

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 300" width="200" height="300">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0%" stop-color="#1a0d2e"/>
+      <stop offset="100%" stop-color="#0a0420"/>
+    </linearGradient>
+    <linearGradient id="goldFrame" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#d4af37"/>
+      <stop offset="100%" stop-color="#8b6914"/>
+    </linearGradient>
+  </defs>
+  <rect width="200" height="300" rx="14" fill="url(#bg)"/>
+  <rect x="8" y="8" width="184" height="284" rx="10" fill="none"
+        stroke="url(#goldFrame)" stroke-width="2"/>
+  <g transform="translate(100 150)" fill="#d4af37" font-family="serif" text-anchor="middle">
+    <circle r="38" fill="none" stroke="#d4af37" stroke-width="1.5"/>
+    <text font-size="48" dy="14" font-style="italic">A</text>
+    <g opacity=".5">
+      <circle cx="-60" cy="-90" r="1.5"/>
+      <circle cx="55" cy="-100" r="1"/>
+      <circle cx="-50" cy="80" r="1.2"/>
+      <circle cx="65" cy="90" r="1"/>
+      <circle cx="0" cy="-110" r="1.6"/>
+    </g>
+  </g>
+  <text x="100" y="280" fill="#d4af37" font-family="serif" font-size="10"
+        text-anchor="middle" letter-spacing="2">ARCANA TAROT</text>
+</svg>