feat: Add Scoreboard and Date Calc pages, update Calculator with scientific mode and new UI

codes/minipro/calculation/miniprogram/pages/index/index.wxml

@@ -53,6 +53,28 @@
                     <text class="sub-label">随机抽取幸运儿</text>
                 </view>
             </view>
+
+             <!-- 记分板 -->
+            <view class="grid-item" bindtap="goToScoreboard" hover-class="grid-item-hover">
+                <view class="icon-box bg-gradient-orange">
+                    <text class="icon">📝</text>
+                </view>
+                <view class="text-box">
+                    <text class="label">万能记分板</text>
+                    <text class="sub-label">桌游/比赛记分</text>
+                </view>
+            </view>
+
+             <!-- 日期计算 -->
+            <view class="grid-item" bindtap="goToDateCalc" hover-class="grid-item-hover">
+                <view class="icon-box bg-gradient-pink">
+                    <text class="icon">📅</text>
+                </view>
+                <view class="text-box">
+                    <text class="label">日期计算</text>
+                    <text class="sub-label">天数推算</text>
+                </view>
+            </view>
         </view>
 
         <!-- 推广/banner区域 -->