feat(position): 岗位课程分配增加全选功能和checkbox样式优化

- 添加表格多选功能，支持全选/取消全选
- 增加批量设为必修/选修操作
- 优化 checkbox 样式（渐变色、圆角、动画）
- 新增批量操作栏UI

frontend/src/views/admin/position-management.vue

@@ -338,40 +338,76 @@
             <div class="course-section">
               <div class="section-header">
                 <h4>可用课程列表</h4>
-                <el-input 
+                <div class="header-actions">
-                  v-model="courseSearchText" 
+                  <el-input 
-                  placeholder="搜索课程名称"
+                    v-model="courseSearchText" 
-                  style="width: 200px"
+                    placeholder="搜索课程名称"
-                  clearable
+                    style="width: 200px"
-                >
+                    clearable
-                  <template #prefix>
+                  >
-                    <el-icon><Search /></el-icon>
+                    <template #prefix>
-                  </template>
+                      <el-icon><Search /></el-icon>
-                </el-input>
+                    </template>
+                  </el-input>
+                </div>
               </div>
-              <el-table :data="filteredAllCourses" style="width: 100%" max-height="300">
+              
-                <el-table-column prop="name" label="课程名称" min-width="200" />
+              <!-- 批量操作栏 -->
-                <el-table-column prop="category" label="分类" width="120">
+              <div class="batch-actions" v-if="selectedCourses.length > 0">
+                <span class="selected-count">已选择 {{ selectedCourses.length }} 门课程</span>
+                <el-button type="danger" size="small" @click="batchAssignCourse('required')">
+                  <el-icon><Star /></el-icon>
+                  批量设为必修
+                </el-button>
+                <el-button type="warning" size="small" @click="batchAssignCourse('optional')">
+                  <el-icon><CollectionTag /></el-icon>
+                  批量设为选修
+                </el-button>
+                <el-button size="small" @click="clearSelection">
+                  取消选择
+                </el-button>
+              </div>
+              
+              <el-table 
+                ref="courseTableRef"
+                :data="filteredAllCourses" 
+                style="width: 100%" 
+                max-height="300"
+                @selection-change="handleSelectionChange"
+                class="course-table"
+              >
+                <el-table-column type="selection" width="55">
+                  <template #header>
+                    <el-checkbox 
+                      v-model="isAllSelected" 
+                      :indeterminate="isIndeterminate"
+                      @change="handleSelectAll"
+                      class="custom-checkbox"
+                    />
+                  </template>
+                </el-table-column>
+                <el-table-column prop="name" label="课程名称" min-width="180" />
+                <el-table-column prop="category" label="分类" width="100">
                   <template #default="scope">
                     <el-tag size="small">{{ scope.row.category }}</el-tag>
                   </template>
                 </el-table-column>
-                <el-table-column prop="duration" label="学时" width="80" />
+                <el-table-column prop="duration" label="学时" width="70" />
-                <el-table-column prop="difficulty" label="难度" width="100">
+                <el-table-column prop="difficulty" label="难度" width="80">
                   <template #default="scope">
                     <el-tag :type="getDifficultyTagType(scope.row.difficulty)" size="small">
                       {{ getDifficultyText(scope.row.difficulty) }}
                     </el-tag>
                   </template>
                 </el-table-column>
-                <el-table-column label="当前状态" width="120">
+                <el-table-column label="当前状态" width="100">
                   <template #default="scope">
                     <el-tag v-if="isCourseRequired(scope.row.id)" type="danger" size="small">必修</el-tag>
                     <el-tag v-else-if="isCourseOptional(scope.row.id)" type="warning" size="small">选修</el-tag>
                     <span v-else class="text-muted">未分配</span>
                   </template>
                 </el-table-column>
-                <el-table-column label="操作" width="200">
+                <el-table-column label="操作" width="180">
                   <template #default="scope">
                     <el-button 
                       v-if="!isCourseRequired(scope.row.id)"
@@ -452,6 +488,12 @@ const requiredCourses = ref<any[]>([])
 const optionalCourses = ref<any[]>([])
 const allCourses = ref<any[]>([])
 
+// 全选相关
+const courseTableRef = ref<any>(null)
+const selectedCourses = ref<any[]>([])
+const isAllSelected = ref(false)
+const isIndeterminate = ref(false)
+
 // 岗位表单
 const positionForm = reactive({
   id: '',
@@ -941,6 +983,67 @@ const filteredAllCourses = computed(() => {
   )
 })
 
+/**
+ * 处理表格选择变化
+ */
+const handleSelectionChange = (selection: any[]) => {
+  selectedCourses.value = selection
+  const total = filteredAllCourses.value.length
+  isAllSelected.value = selection.length === total && total > 0
+  isIndeterminate.value = selection.length > 0 && selection.length < total
+}
+
+/**
+ * 全选/取消全选
+ */
+const handleSelectAll = (val: boolean) => {
+  if (courseTableRef.value) {
+    if (val) {
+      filteredAllCourses.value.forEach(row => {
+        courseTableRef.value.toggleRowSelection(row, true)
+      })
+    } else {
+      courseTableRef.value.clearSelection()
+    }
+  }
+}
+
+/**
+ * 清除选择
+ */
+const clearSelection = () => {
+  if (courseTableRef.value) {
+    courseTableRef.value.clearSelection()
+  }
+  selectedCourses.value = []
+  isAllSelected.value = false
+  isIndeterminate.value = false
+}
+
+/**
+ * 批量分配课程
+ */
+const batchAssignCourse = async (type: 'required' | 'optional') => {
+  if (!currentPosition.value || selectedCourses.value.length === 0) return
+  
+  try {
+    const courseIds = selectedCourses.value.map(c => c.id)
+    const response = await request.post(`/api/v1/admin/positions/${currentPosition.value.id}/courses`, {
+      course_ids: courseIds,
+      course_type: type
+    })
+    
+    if (response && response.code === 200) {
+      await loadPositionCourses(currentPosition.value.id)
+      clearSelection()
+      ElMessage.success(`已将 ${courseIds.length} 门课程设为${type === 'required' ? '必修' : '选修'}`)
+    }
+  } catch (error) {
+    console.error('批量分配课程失败:', error)
+    ElMessage.error('批量分配课程失败')
+  }
+}
+
 /**
  * 检查课程是否为必修
  */
@@ -1326,11 +1429,120 @@ onMounted(() => {
         color: #333;
         margin: 0;
       }
+      
+      .header-actions {
+        display: flex;
+        gap: 12px;
+        align-items: center;
+      }
+    }
+    
+    // 批量操作栏样式
+    .batch-actions {
+      display: flex;
+      align-items: center;
+      gap: 12px;
+      padding: 12px 16px;
+      margin-bottom: 12px;
+      background: linear-gradient(135deg, #e8f4fd 0%, #f0f7ff 100%);
+      border-radius: 8px;
+      border: 1px solid #d4e8fc;
+      
+      .selected-count {
+        font-size: 14px;
+        font-weight: 500;
+        color: #409eff;
+        margin-right: 8px;
+      }
+      
+      .el-button {
+        &.el-button--danger {
+          background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
+          border: none;
+          
+          &:hover {
+            background: linear-gradient(135deg, #ff5252 0%, #d63031 100%);
+          }
+        }
+        
+        &.el-button--warning {
+          background: linear-gradient(135deg, #ffa726 0%, #ff9800 100%);
+          border: none;
+          
+          &:hover {
+            background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
+          }
+        }
+      }
     }
     
     .text-muted {
       color: #909399;
     }
+    
+    // 课程表格样式优化
+    .course-table {
+      // Checkbox 样式优化
+      :deep(.el-checkbox) {
+        .el-checkbox__inner {
+          width: 18px;
+          height: 18px;
+          border-radius: 4px;
+          border: 2px solid #dcdfe6;
+          transition: all 0.2s ease;
+          
+          &::after {
+            width: 4px;
+            height: 8px;
+            left: 5px;
+            top: 1px;
+            border-width: 2px;
+          }
+        }
+        
+        &:hover .el-checkbox__inner {
+          border-color: #409eff;
+        }
+        
+        &.is-checked .el-checkbox__inner {
+          background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+          border-color: #667eea;
+        }
+        
+        &.is-indeterminate .el-checkbox__inner {
+          background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+          border-color: #667eea;
+          
+          &::before {
+            height: 3px;
+            top: 6px;
+            left: 3px;
+            right: 3px;
+          }
+        }
+      }
+      
+      // 表格行选中效果
+      :deep(.el-table__row) {
+        &.current-row,
+        &:hover {
+          background-color: #f5f7fa;
+        }
+        
+        &.selection-row {
+          background-color: #ecf5ff;
+        }
+      }
+      
+      // 表头样式
+      :deep(.el-table__header-wrapper) {
+        th {
+          background-color: #fafafa;
+          font-weight: 600;
+          color: #333;
+        }
+      }
+    }
   }
 }