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

apps/DEMO-miniprogram/miniprogram/components/ai-float-button/ai-float-button.wxss

@@ -0,0 +1,56 @@
+/* AI 悬浮按钮 — 忠于 H5 原型：渐变流动背景 + 机器人 SVG */
+/* H5: 56px → 56×2×0.875 = 98rpx */
+
+.ai-float-btn-container {
+  position: fixed;
+  right: 28rpx;
+  z-index: 100;
+}
+
+.ai-float-btn {
+  width: 98rpx;
+  height: 98rpx;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  position: relative;
+  overflow: hidden;
+  /* 渐变动画背景 — 忠于 H5 原型 */
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 25%, #f093fb 50%, #f5576c 75%, #667eea 100%);
+  background-size: 400% 400%;
+  animation: gradientShift 8s ease infinite;
+  box-shadow: 0 8rpx 40rpx rgba(102, 126, 234, 0.4);
+}
+
+.ai-float-btn:active {
+  transform: scale(0.95);
+}
+
+/* 高光叠加层 */
+.ai-float-btn-highlight {
+  position: absolute;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background: linear-gradient(145deg, rgba(255,255,255,0.2) 0%, transparent 50%, rgba(0,0,0,0.1) 100%);
+  border-radius: 50%;
+  pointer-events: none;
+}
+
+/* 背景渐变流动动画 */
+@keyframes gradientShift {
+  0% { background-position: 0% 50%; }
+  25% { background-position: 50% 100%; }
+  50% { background-position: 100% 50%; }
+  75% { background-position: 50% 0%; }
+  100% { background-position: 0% 50%; }
+}
+
+/* SVG 图标 H5: 30px → 52rpx */
+.ai-icon-svg {
+  height: 60rpx;
+  position: relative;
+  z-index: 1;
+}