feat(dashboard): LevelDistribution 5个conic-gradient环形图

frontend/pages/dashboard/components/CollectionMatrix.vue

@@ -5,12 +5,16 @@
     <!-- TOP 5 -->
     <TopFiveAssets :items="topFive || []" />
 
-    <!-- 后续 Task 11/12 在此追加 LevelDistribution / UpcomingUpgrades / RecentUpgrades -->
+    <!-- 等级分布 -->
+    <LevelDistribution :items="levels" />
+
+    <!-- 后续 Task 12 在此追加 UpcomingUpgrades / RecentUpgrades -->
   </view>
 </template>
 
 <script setup>
 import TopFiveAssets from './TopFiveAssets.vue'
+import LevelDistribution from './LevelDistribution.vue'
 
 defineProps({
   topFive: { type: Array, default: () => [] },

frontend/pages/dashboard/components/LevelDistribution.vue

@@ -0,0 +1,145 @@
+<template>
+  <view class="level-distribution">
+    <text class="card-title">藏品等级分布</text>
+    <view v-if="!items || items.length === 0" class="empty-row">
+      <text class="empty-text">暂无数据</text>
+    </view>
+    <view v-else class="ring-row">
+      <view
+        v-for="item in items"
+        :key="item.level"
+        class="ring-cell"
+      >
+        <view
+          class="ring-outer"
+          :style="getRingStyle(item)"
+        >
+          <view class="ring-inner">
+            <text class="ring-count">{{ item.count }}</text>
+          </view>
+        </view>
+        <text class="ring-label">{{ item.level }}</text>
+        <text class="ring-pct">{{ getPercent(item) }}%</text>
+      </view>
+    </view>
+  </view>
+</template>
+
+<script setup>
+const props = defineProps({
+  items: { type: Array, default: () => [] }, // AssetLevelItem[]
+})
+
+function getPercent(item) {
+  if (!item.total) return 0
+  return Math.round((item.count / item.total) * 100)
+}
+
+function getRingStyle(item) {
+  const pct = getPercent(item)
+  const colorMap = {
+    UR: '#FF8A65, #FFD740',
+    SSR: '#FF5E9C, #FFB199',
+    SR: '#B17BFF, #FF8FE6',
+    R: '#5EDFFF, #6FA9FF',
+    N: '#C5C5C5, #8C8C8C',
+  }
+  const colors = colorMap[item.level] || '#999, #ccc'
+  // 占位 0 显示灰色环
+  if (pct === 0) {
+    return {
+      background: 'conic-gradient(rgba(255,255,255,0.1) 0deg, rgba(255,255,255,0.1) 360deg)',
+    }
+  }
+  // 渐变环：从顶部开始，pct% 处停止
+  return {
+    background: `conic-gradient(${colors} 0deg ${pct * 3.6}deg, rgba(255,255,255,0.1) ${pct * 3.6}deg 360deg)`,
+  }
+}
+</script>
+
+<style lang="scss" scoped>
+.level-distribution {
+  background: rgba(255, 255, 255, 0.1);
+  border-radius: 17rpx;
+  padding: 20rpx;
+  margin-top: 16rpx;
+  box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.15);
+}
+
+.card-title {
+  display: block;
+  font-size: 28rpx;
+  font-weight: 600;
+  color: #ffffff;
+  margin-bottom: 16rpx;
+}
+
+.ring-row {
+  display: flex;
+  justify-content: space-around;
+  align-items: center;
+  padding: 16rpx 0;
+}
+
+.ring-cell {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  flex: 1;
+}
+
+.ring-outer {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  position: relative;
+  box-shadow: 0 0 12px rgba(255, 255, 255, 0.15);
+}
+
+.ring-inner {
+  width: 60rpx;
+  height: 60rpx;
+  border-radius: 50%;
+  background: rgba(0, 0, 0, 0.3);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  backdrop-filter: blur(4px);
+}
+
+.ring-count {
+  font-size: 24rpx;
+  font-weight: 700;
+  color: #FFFABD;
+  font-family: 'Baloo Bhai', sans-serif;
+}
+
+.ring-label {
+  margin-top: 8rpx;
+  font-size: 20rpx;
+  font-weight: 600;
+  color: rgba(255, 255, 255, 0.9);
+}
+
+.ring-pct {
+  font-size: 18rpx;
+  color: rgba(255, 255, 255, 0.6);
+  margin-top: 2rpx;
+}
+
+.empty-row {
+  height: 120rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.empty-text {
+  color: rgba(255, 255, 255, 0.5);
+  font-size: 24rpx;
+}
+</style>