feat: 市场调研落地——趋势AI人话解读（plainExplain/takeAway，采集自动生成+SSR+小程序卡）+ 首页今日知识卡

client/src/pages/index/index.vue

@@ -82,6 +82,20 @@
       </view>
     </view>
 
+    <!-- 今日知识卡：每天一条，读了答对就点亮 -->
+    <view class="kcard" v-if="todayKnowledge" @tap="goTodayKnowledge">
+      <view class="kcard-head">
+        <AppIcon name="book" :size="14" />
+        <text class="kcard-label">今日知识卡</text>
+        <text class="kcard-dim">{{ todayDimName }}</text>
+      </view>
+      <text class="kcard-title">{{ todayKnowledge.title }}</text>
+      <text class="kcard-desc">{{ todayKnowledge.content }}</text>
+      <view class="kcard-foot">
+        <text class="kcard-cta">去读一读 · 答对点亮 →</text>
+      </view>
+    </view>
+
     <!-- 今日快讯 -->
     <view class="section-header">
       <text class="section-title">今日快讯</text>
@@ -114,6 +128,18 @@ const dimensions = ref(DIMENSIONS)
 
 const newsList = ref([])
 const byDim = ref({})          // 各星域知识总数
+const todayKnowledge = ref<any>(null)
+
+const todayDimName = computed(() => {
+  const d = DIMENSIONS.find(x => x.id === todayKnowledge.value?.dim)
+  return d ? d.name : ''
+})
+
+function goTodayKnowledge() {
+  if (todayKnowledge.value?._id) {
+    uni.navigateTo({ url: `/pages/detail/detail?id=${todayKnowledge.value._id}` })
+  }
+}
 const userStats = ref(null)    // { totalLit, litByDim, streak }
 const lastRead = ref(null)
 
@@ -128,9 +154,21 @@ const todayLit = computed(() => !!uni.getStorageSync('lit_today'))
 onShow(() => {
   loadStats()
   loadNews()
+  loadTodayKnowledge()
   lastRead.value = uni.getStorageSync('last_read') || null
 })
 
+// 今日知识卡：按日期取当日第 N 条（同一天所有人看到同一条，形成"每日一词"共识感）
+async function loadTodayKnowledge() {
+  try {
+    const data = await knowledgeApi.list({ limit: 50, page: 1 })
+    const items = (data.items || []).filter((x) => x.content)
+    if (!items.length) return
+    const dayIndex = Math.floor(Date.now() / 86400000)
+    todayKnowledge.value = items[dayIndex % items.length]
+  } catch (e) { /* 静默 */ }
+}
+
 onPullDownRefresh(async () => {
   await Promise.all([loadStats(), loadNews()])
   uni.stopPullDownRefresh()
@@ -468,3 +506,42 @@ onShareTimeline(() => ({
 
 .bottom-spacer { height: 30px; }
 </style>
+
+<style scoped>
+.kcard {
+  background: linear-gradient(135deg, rgba(91, 95, 248, 0.08), rgba(139, 92, 246, 0.05));
+  border: 1px solid var(--glass-hover-border);
+  border-radius: var(--radius-lg);
+  padding: 14px 16px;
+  margin-bottom: 12px;
+}
+.kcard-head { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
+.kcard-label { font-size: 12px; font-weight: 700; color: var(--color-brand); }
+.kcard-dim {
+  margin-left: auto;
+  font-size: 10px;
+  color: var(--text-tertiary);
+  background: var(--glass-bg);
+  border-radius: 999px;
+  padding: 2px 8px;
+}
+.kcard-title {
+  display: block;
+  font-size: 15px;
+  font-weight: 700;
+  color: var(--text-primary);
+  line-height: 1.5;
+  margin-bottom: 6px;
+}
+.kcard-desc {
+  display: -webkit-box;
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 2;
+  overflow: hidden;
+  font-size: 12px;
+  color: var(--text-tertiary);
+  line-height: 1.6;
+}
+.kcard-foot { margin-top: 8px; }
+.kcard-cta { font-size: 11px; font-weight: 600; color: var(--color-brand); }
+</style>

client/src/pages/trend/trend.vue

@@ -41,6 +41,18 @@
           {{ item.summary }}
         </text>
 
+        <!-- 人话解读：一句话说清 + 对你意味着什么 -->
+        <view class="card-plain" v-if="item.plainExplain">
+          <view class="plain-line">
+            <text class="plain-tag">人话</text>
+            <text class="plain-text">{{ item.plainExplain }}</text>
+          </view>
+          <view class="plain-line" v-if="item.takeAway">
+            <text class="plain-tag alt">对你</text>
+            <text class="plain-text">{{ item.takeAway }}</text>
+          </view>
+        </view>
+
         <!-- 底部信息 -->
         <view class="card-footer">
           <text class="card-date">{{ formatDate(item.newsDate) }}</text>
@@ -403,3 +415,29 @@ onShareAppMessage(() => {
   display: block;
 }
 </style>
+
+<style scoped>
+.card-plain {
+  margin-top: 8px;
+  background: var(--color-brand-bg);
+  border: 1px solid var(--glass-hover-border);
+  border-radius: 10px;
+  padding: 8px 10px;
+  display: flex;
+  flex-direction: column;
+  gap: 5px;
+}
+.plain-line { display: flex; align-items: flex-start; gap: 6px; }
+.plain-tag {
+  flex-shrink: 0;
+  font-size: 10px;
+  font-weight: 700;
+  color: #fff;
+  background: var(--color-brand);
+  border-radius: 5px;
+  padding: 1px 6px;
+  margin-top: 1px;
+}
+.plain-tag.alt { background: var(--dim3-color); }
+.plain-text { font-size: 12px; color: var(--text-primary); line-height: 1.6; }
+</style>