fix: 优化安防箱环境数据卡片空标签渲染并重构风扇展示

为温度、湿度、门禁和防雷标签添加数据存在性判断，避免渲染空标签；移除冗余计算属性，改为循环直接展示每个风扇转速

src/components/device/device-card/components/current-diag/security-box-env-card.vue

@@ -35,11 +35,6 @@ const getStatusTagType = (status: string | null) => {
   if (['失效', '开门'].includes(status ?? '')) return 'error';
   return 'default';
 };
-
-const formattedFanSpeeds = computed(() => {
-  if (!fanSpeeds?.value || fanSpeeds.value.length === 0) return null;
-  return fanSpeeds.value.map((speed, index) => `风扇${index + 1}: ${speed} RPM`).join(', ');
-});
 </script>
 
 <template>
@@ -49,7 +44,7 @@ const formattedFanSpeeds = computed(() => {
     </template>
     <template #default>
       <NFlex vertical>
-        <NTag>
+        <NTag v-if="!!temperature">
           <template #icon>
             <NIcon :component="ThermometerIcon" />
           </template>
@@ -57,7 +52,7 @@ const formattedFanSpeeds = computed(() => {
             <span>温度: {{ temperature }}℃</span>
           </template>
         </NTag>
-        <NTag>
+        <NTag v-if="!!humidity">
           <template #icon>
             <NIcon :component="DropletIcon" />
           </template>
@@ -65,15 +60,15 @@ const formattedFanSpeeds = computed(() => {
             <span>湿度: {{ humidity }}%</span>
           </template>
         </NTag>
-        <NTag>
+        <NTag v-for="(speed, index) in fanSpeeds ?? []" :key="index">
           <template #icon>
             <NIcon :component="FanIcon" />
           </template>
           <template #default>
-            <span>风扇: {{ formattedFanSpeeds }}</span>
+            <span>风扇{{ index + 1 }}: {{ speed }} RPM</span>
           </template>
         </NTag>
-        <NTag :type="getStatusTagType(accessControlStatus)">
+        <NTag v-if="!!accessControlStatus" :type="getStatusTagType(accessControlStatus)">
           <template #icon>
             <NIcon :component="ShieldIcon" />
           </template>
@@ -81,7 +76,7 @@ const formattedFanSpeeds = computed(() => {
             <span>门禁: {{ accessControlStatus }}</span>
           </template>
         </NTag>
-        <NTag :type="getStatusTagType(lightningProtectionStatus)">
+        <NTag v-if="!!lightningProtectionStatus" :type="getStatusTagType(lightningProtectionStatus)">
           <template #icon>
             <NIcon :component="ZapIcon" />
           </template>