feat(calendar): 添加日历组件并替换待办事项列表

重构待办事项列表为日历视图，添加@fullcalendar/core依赖
支持营期设置、日期选择和事件展示功能

my-vue-app/src/views/secondTop/secondTop.vue

@@ -24,23 +24,6 @@
               <p>统筹多组运营，优化资源配置，驱动业绩增长，实现团队协同发展。</p>
             </div>
 
-            <!-- 营期阶段信息与调控 -->
-            <div class="stage-info" style="margin-left: 100px;">
-              <span class="stage-label">营期所属阶段：</span>
-              <span class="stage-value">{{ currentStage }}</span>
-
-              <!-- 仅在"接数据"阶段显示调控UI -->
-              <div v-if="isDataReceivingStage" class="stage-control">
-                <span class="control-label">调整"接数据"天数:</span>
-                <input type="number" v-model.number="dataReceivingStage.days" min="1" class="days-input" />
-                <button @click="saveCampSettings" class="save-button">保存</button>
-              </div>
-              
-              <!-- 非接数据阶段显示结束营期按钮 -->
-              <div v-if="!isDataReceivingStage" class="stage-control">
-                <button @click="finishCamp" class="finish-camp-button">结束营期</button>
-              </div>
-            </div>
           </template>
           
           <div v-if="!isRouteNavigation">