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

apps/DEMO-miniprogram/miniprogram/pages/chat-history/chat-history.wxml

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+<!-- pages/chat-history/chat-history.wxml — 对话历史 -->
+
+<!-- 加载态（toast 浮层，不白屏） -->
+<view class="g-toast-loading" wx:if="{{pageState === 'loading'}}">
+  <view class="g-toast-loading-inner">
+    <t-loading theme="circular" size="40rpx" />
+    <text class="g-toast-loading-text">加载中...</text>
+  </view>
+</view>
+
+<!-- 错误态 -->
+<view class="page-error" wx:elif="{{pageState === 'error'}}">
+  <view class="error-content">
+    <text class="error-icon">😵</text>
+    <text class="error-text">加载失败，请重试</text>
+    <view class="retry-btn" hover-class="retry-btn--hover" bindtap="onRetry">
+      <text class="retry-btn-text">重新加载</text>
+    </view>
+  </view>
+</view>
+
+<!-- 空态 -->
+<view class="page-empty-wrap" wx:elif="{{pageState === 'empty'}}">
+  <view class="page-empty">
+    <t-empty description="暂无对话记录" />
+  </view>
+</view>
+
+<!-- 正常态 -->
+<view class="page-normal" wx:elif="{{pageState === 'normal'}}">
+
+  <!-- 对话列表 -->
+  <view class="chat-list">
+    <view
+      class="chat-item"
+      hover-class="chat-item--hover"
+      wx:for="{{list}}"
+      wx:key="id"
+      data-id="{{item.id}}"
+      bindtap="onItemTap"
+    >
+      <view class="chat-icon-box" style="background: {{item.iconGradient}};">
+        <t-icon name="chat" size="40rpx" color="#ffffff" />
+      </view>
+      <view class="chat-content">
+        <view class="chat-top">
+          <text class="chat-title text-ellipsis">{{item.title}}</text>
+          <text class="chat-time">{{item.timeLabel}}</text>
+        </view>
+        <view class="chat-bottom">
+          <text class="chat-summary text-ellipsis" wx:if="{{item.customerName}}">{{item.customerName}} · {{item.lastMessage}}</text>
+          <text class="chat-summary text-ellipsis" wx:else>{{item.lastMessage}}</text>
+        </view>
+      </view>
+      <t-icon name="chevron-right" size="32rpx" color="#c5c5c5" />
+    </view>
+  </view>
+
+  <!-- 底部提示 -->
+  <view class="list-footer">
+    <text class="footer-text">— 已加载全部记录 —</text>
+  </view>
+
+  <!-- AI 悬浮按钮 -->
+  <ai-float-button />
+</view>
+
+<dev-fab />