fix: 任务列表优先级显示英文转中文

API返回英文优先级(high/medium/low)，前端显示转换为中文(高/中/低)

frontend/src/views/manager/assignment-center.vue

@@ -55,7 +55,7 @@
             <div class="task-title-section">
               <h3 class="task-title">{{ task.title }}</h3>
               <el-tag :type="getTaskTagType(task.priority)" size="small">
-                {{ task.priority }}
+                {{ getPriorityLabel(task.priority) }}
               </el-tag>
             </div>
             <el-dropdown trigger="click">
@@ -783,11 +783,30 @@ const deleteTaskItem = async (task: Task) => {
   }
 }
 
+/**
+ * 优先级英文转中文映射
+ */
+const priorityToChineseMap: Record<string, string> = {
+  'high': '高',
+  'medium': '中',
+  'low': '低'
+}
+
+/**
+ * 获取中文优先级显示
+ */
+const getPriorityLabel = (priority: string) => {
+  return priorityToChineseMap[priority] || priority
+}
+
 /**
  * 获取任务标签类型
  */
 const getTaskTagType = (priority: string) => {
   const typeMap: Record<string, string> = {
+    'high': 'danger',
+    'medium': 'warning',
+    'low': 'info',
     '高': 'danger',
     '中': 'warning',
     '低': 'info'