refactor(employeeProfile): 优化职业资格证书展示逻辑

- 由单一证书时间展示改为显示多个等级对应证书信息
- 使用computed计算当前及之前所有等级证书数据
- 模板中动态渲染多个证书名称及时间，提升展示准确性
- 删除无用的getQualificationTime计算属性
- 改进用户界面，更清晰体现职业资格证书层级关系

src/views/portraitManagement/employeeProfile/index.vue

@@ -132,8 +132,9 @@
             </Card>
             <Card title="职业资格证书情况">
               <div class="cert-info">
-                <span class="cert-name">证书名称：{{ portrait?.qualificationLevelText || '-' }} 时间：{{ getQualificationTime|| '-' }}</span>
-              
+                <div class="cert-item" v-for="level in displayQualificationLevels" :key="level.field">
+                  <span class="cert-name">{{ level.label }}：{{ qualificationData?.[level.field] || '-' }}</span>
+                </div>
               </div>
             </Card>
           </div>
@@ -306,14 +307,12 @@ const qualificationLevelMap = [
   { label: '五级', field: 'levelFiveTime' }
 ]
 
-const getQualificationTime = computed(() => {
-  const certName = portrait.value?.qualificationLevelText || '-';
-  
-  const item = qualificationLevelMap.find(l => l.label === certName)
-  if (item) {
-    return qualificationData.value?.[item.field] || '-'
-  }
-  return '-'
+const displayQualificationLevels = computed(() => {
+  const currentLevel = portrait.value?.qualificationLevelText
+  if (!currentLevel) return []
+  const currentIndex = qualificationLevelMap.findIndex(l => l.label === currentLevel)
+  if (currentIndex === -1) return []
+  return qualificationLevelMap.slice(0, currentIndex + 1)
 })