fix: 添加关键词提示和推荐知识的条件渲染

src/views/main/phone/index.vue

                             </div>
 
                             <!-- 关键词提示 -->
-                            <div class="space-y-2">
+                            <div class="space-y-2" v-if="keywords.length > 0">
                                 <h4 class="font-medium text-sm text-gray-600">关键词提示</h4>
                                 <div class="flex flex-wrap gap-2">
                                     <el-tag v-for="(keyword, idx) in keywords" class="relative transition-transform duration-300 ease-in-out hover:scale-105" :key="idx" :type="keyword.type"
                                 </div>
                             </div>
                             <!-- 推荐知识 -->
-                            <div class="mt-4 space-y-4">
+                            <div class="mt-4 space-y-4" v-if="recommendedKnowledge.length > 0">
                                 <h4 class="font-medium text-sm text-gray-600">推荐知识</h4>
                                 <div class="space-y-4">
                                     <div v-for="(item, idx) in recommendedKnowledge" :key="idx"
             keywords.value[index].count++;
             keywords.value[index].type = types[keywords.value[index].count % types.length];
         } else {
+            
             keywords.value.push({
                 text: key,
                 type: 'primary',