feat(analytics): 在访问统计中增加同比趋势显示

- 在访问概览 API 中新增昨日、上周、上月 PV 字段，用于计算趋势
- 在前端统计卡片中显示今日、本周、本月访问量的同比变化百分比
- 支持 163 邮箱作为邮件通知服务提供商，更新相关文档和设置界面

cwd-admin/src/views/AnalyticsVisitView/index.vue

@@ -25,15 +25,48 @@
           </div>
           <div class="stats-item">
             <div class="stats-label">今日访问量</div>
-            <div class="stats-value">{{ overview.todayPv }}</div>
+            <div class="stats-value">
+              {{ overview.todayPv }}
+              <span
+                v-if="overview.yesterdayPv !== undefined"
+                class="trend"
+                :class="percentageChange >= 0 ? 'up' : 'down'"
+                :title="`对比昨日 ${percentageChange >= 0 ? '增加' : '减少'} ${Math.abs(percentageChange).toFixed(1)}%`"
+              >
+                <span class="trend-arrow">{{ percentageChange >= 0 ? '↑' : '↓' }}</span>
+                {{ Math.abs(percentageChange).toFixed(1) }}%
+              </span>
+            </div>
           </div>
           <div class="stats-item">
             <div class="stats-label">本周访问量</div>
-            <div class="stats-value">{{ overview.weekPv }}</div>
+            <div class="stats-value">
+              {{ overview.weekPv }}
+              <span
+                v-if="overview.lastWeekPv !== undefined"
+                class="trend"
+                :class="weekPercentageChange >= 0 ? 'up' : 'down'"
+                :title="`对比上周 ${weekPercentageChange >= 0 ? '增加' : '减少'} ${Math.abs(weekPercentageChange).toFixed(1)}%`"
+              >
+                <span class="trend-arrow">{{ weekPercentageChange >= 0 ? '↑' : '↓' }}</span>
+                {{ Math.abs(weekPercentageChange).toFixed(1) }}%
+              </span>
+            </div>
           </div>
           <div class="stats-item">
             <div class="stats-label">本月访问量</div>
-            <div class="stats-value">{{ overview.monthPv }}</div>
+            <div class="stats-value">
+              {{ overview.monthPv }}
+              <span
+                v-if="overview.lastMonthPv !== undefined"
+                class="trend"
+                :class="monthPercentageChange >= 0 ? 'up' : 'down'"
+                :title="`对比上月 ${monthPercentageChange >= 0 ? '增加' : '减少'} ${Math.abs(monthPercentageChange).toFixed(1)}%`"
+              >
+                <span class="trend-arrow">{{ monthPercentageChange >= 0 ? '↑' : '↓' }}</span>
+                {{ Math.abs(monthPercentageChange).toFixed(1) }}%
+              </span>
+            </div>
           </div>
           <div class="stats-item">
             <div class="stats-label">有访问记录的页面数</div>
@@ -198,11 +231,33 @@ const overview = ref<VisitOverviewResponse>({
   totalPv: 0,
   totalPages: 0,
   todayPv: 0,
+  yesterdayPv: 0,
   weekPv: 0,
+  lastWeekPv: 0,
   monthPv: 0,
+  lastMonthPv: 0,
   last30Days: [],
 });
 
+function calculateChange(current: number, previous: number) {
+  if (previous === 0) {
+    return current > 0 ? 100 : 0;
+  }
+  return ((current - previous) / previous) * 100;
+}
+
+const percentageChange = computed(() => {
+  return calculateChange(overview.value.todayPv, overview.value.yesterdayPv || 0);
+});
+
+const weekPercentageChange = computed(() => {
+  return calculateChange(overview.value.weekPv, overview.value.lastWeekPv || 0);
+});
+
+const monthPercentageChange = computed(() => {
+  return calculateChange(overview.value.monthPv, overview.value.lastMonthPv || 0);
+});
+
 const rawItems = ref<VisitPageItem[]>([]);
 const items = computed<VisitPageItem[]>(() => {
   const list = rawItems.value.slice();
@@ -390,8 +445,11 @@ async function loadData() {
       totalPv: overviewRes.totalPv,
       totalPages: overviewRes.totalPages,
       todayPv: overviewRes.todayPv ?? 0,
+      yesterdayPv: overviewRes.yesterdayPv ?? 0,
       weekPv: overviewRes.weekPv ?? 0,
+      lastWeekPv: overviewRes.lastWeekPv ?? 0,
       monthPv: overviewRes.monthPv ?? 0,
+      lastMonthPv: overviewRes.lastMonthPv ?? 0,
       last30Days: Array.isArray(overviewRes.last30Days)
         ? overviewRes.last30Days
         : [],

cwd-admin/src/views/SettingsView/index.vue

@@ -305,6 +305,7 @@
                     @change="onProviderChange"
                   >
                     <option value="qq">QQ 邮箱</option>
+                    <option value="163">163 邮箱</option>
                     <option value="custom">自定义 SMTP</option>
                   </select>
                 </div>
@@ -361,6 +362,10 @@
                     请登录 QQ 邮箱网页版，在【设置 - 账户】中开启 POP3/SMTP
                     服务并生成授权码。
                   </div>
+                  <div v-else-if="smtpProvider === '163'" class="form-hint">
+                    注意：163 邮箱必须使用授权码，而非登录密码。<br />
+                    请登录 163 邮箱网页版，在【设置 - POP3/SMTP/IMAP】中开启服务并生成授权码。
+                  </div>
                 </div>
 
                 <div class="divider"></div>
@@ -816,6 +821,10 @@ function onProviderChange() {
     smtpHost.value = "smtp.qq.com";
     smtpPort.value = 465;
     smtpSecure.value = true;
+  } else if (smtpProvider.value === "163") {
+    smtpHost.value = "smtp.163.com";
+    smtpPort.value = 465;
+    smtpSecure.value = true;
   }
 }
 
@@ -893,6 +902,8 @@ async function load() {
 
       if (emailNotifyRes.smtp.host === "smtp.qq.com") {
         smtpProvider.value = "qq";
+      } else if (emailNotifyRes.smtp.host === "smtp.163.com") {
+        smtpProvider.value = "163";
       } else {
         smtpProvider.value = "custom";
       }