feat: batch update - gift card breakdown spec, backend APIs, miniprogram pages, ETL finance recharge, docs & migrations

apps/DEMO-miniprogram/miniprogram/assets/icons/ball-gray.svg

@@ -0,0 +1,18 @@
+<!-- 灰色台球 - 大号8 -->
+<svg width="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <radialGradient id="ballGrayGradient" cx="35%" cy="35%">
+      <stop offset="0%" style="stop-color:#d0d0d0;stop-opacity:1" />
+      <stop offset="70%" style="stop-color:#c5c5c5;stop-opacity:1" />
+      <stop offset="100%" style="stop-color:#a6a6a6;stop-opacity:1" />
+    </radialGradient>
+  </defs>
+  <!-- 球体 -->
+  <circle cx="24" cy="24" r="18" fill="url(#ballGrayGradient)" opacity="0.5"/>
+  <!-- 高光 -->
+  <ellipse cx="18" cy="16" rx="6" ry="4" fill="white" opacity="0.3"/>
+  <!-- 白色圆圈 -->
+  <circle cx="24" cy="24" r="8" fill="white" opacity="0.6"/>
+  <!-- 数字8 -->
+  <text x="24" y="29" font-family="Arial, sans-serif" font-size="11" font-weight="bold" fill="#a6a6a6" text-anchor="middle" opacity="0.6">8</text>
+</svg>