feat: 添加看视频得金币功能

- 每日可观看5次视频，- 每次观看获得3金币
- 显示今日剩余观看次数
- 记录观看历史到金币记录

xuan-deduct-uniapp/src/pages/mine/coins.vue

@@ -39,6 +39,21 @@
     <view class="task-card">
       <text class="task-title">其他任务</text>
       
+      <view class="task-item">
+        <view class="task-left">
+          <view class="task-icon">
+            <text class="task-icon-text">🎬</text>
+          </view>
+          <view class="task-info">
+            <text class="task-name">看视频得金币</text>
+            <text class="task-reward">+3金币/次 (今日剩余{{ videoCount }}次)</text>
+          </view>
+        </view>
+        <view class="task-btn" :class="{ disabled: videoCount <= 0 }" @click="watchVideo">
+          <text class="task-btn-text">{{ videoCount > 0 ? '观看' : '已用完' }}</text>
+        </view>
+      </view>
+      
       <view class="task-item">
         <view class="task-left">
           <view class="task-icon">
@@ -92,7 +107,8 @@ export default {
       signedToday: false,
       streakDays: 0,
       weekDays: [],
-      records: []
+      records: [],
+      videoCount: 5
     }
   },
   computed: {
@@ -104,6 +120,7 @@ export default {
     this.loadCoins()
     this.initWeekProgress()
     this.loadRecords()
+    this.loadVideoCount()
   },
   onShareAppMessage() {
     return {
@@ -211,6 +228,44 @@ export default {
         menus: ['shareAppMessage']
       })
     },
+    loadVideoCount() {
+      const today = this.formatDate(new Date())
+      const lastVideoDate = uni.getStorageSync('lastVideoDate')
+      if (lastVideoDate === today) {
+        this.videoCount = uni.getStorageSync('videoCount') || 0
+      } else {
+        this.videoCount = 5
+        uni.setStorageSync('lastVideoDate', today)
+        uni.setStorageSync('videoCount', 5)
+      }
+    },
+    watchVideo() {
+      if (this.videoCount <= 0) {
+        uni.showToast({ title: '今日观看次数已用完', icon: 'none' })
+        return
+      }
+      
+      uni.showLoading({ title: '加载视频中...' })
+      
+      setTimeout(() => {
+        uni.hideLoading()
+        
+        this.videoCount--
+        this.coins += 3
+        
+        uni.setStorageSync('userCoins', this.coins)
+        uni.setStorageSync('videoCount', this.videoCount)
+        
+        this.records.unshift({
+          name: '观看视频',
+          amount: 3,
+          time: this.formatTime(new Date())
+        })
+        this.saveRecords()
+        
+        uni.showToast({ title: '+3金币', icon: 'success' })
+      }, 2000)
+    },
     formatDate(date) {
       const y = date.getFullYear()
       const m = String(date.getMonth() + 1).padStart(2, '0')
@@ -467,6 +522,10 @@ page {
   border-radius: 32rpx;
 }
 
+.task-btn.disabled {
+  background: #D1D5DB;
+}
+
 .task-btn-text {
   font-size: 26rpx;
   color: #ffffff;

xuan-deduct-uniapp/src/pages/mine/mine.vue

@@ -173,13 +173,15 @@ page {
   font-size: 36rpx;
   font-weight: 700;
   color: #ffffff;
-  line-height: 1.2;
 }
 
 .vip-tag {
   margin-left: 8rpx;
-  padding: 2rpx 10rpx;
+  padding: 0 8rpx;
   border-radius: 12rpx;
+  height: 28rpx;
+  display: inline-flex;
+  align-items: flex-start;
 }
 
 .vip-tag.normal {
@@ -203,9 +205,10 @@ page {
 }
 
 .vip-tag-text {
-  font-size: 18rpx;
+  font-size: 16rpx;
   font-weight: 500;
   color: #ffffff;
+  line-height: 28rpx;
 }
 
 .user-coins {