fix: 修复需求类型下拉框显示错误，应显示任务子类型（新品/优化/视频/实拍等）

1. 需求类型下拉从 demandTypes（任务类型）改为 taskSubTypes（任务子类型）
2. filters 中移除 demandTypeId，使用 taskSubType
3. completedFilters 中也同步修复

frontend/src/views/TaskHall.vue

@@ -113,18 +113,18 @@
             </a-select>
 
             <a-select
-              v-model:value="filters.demandTypeId"
+              v-model:value="filters.taskSubType"
               placeholder="需求类型"
               class="filter-select"
               allowClear
               @change="handleFilterChange"
             >
               <a-select-option
-                v-for="type in demandTypes"
-                :key="type.id"
-                :value="type.id"
+                v-for="subType in taskSubTypes"
+                :key="subType.id"
+                :value="subType.name"
               >
-                {{ type.name }}
+                {{ subType.name }}
               </a-select-option>
             </a-select>
 
@@ -1266,18 +1266,18 @@
                 </a-select>
 
                 <a-select
-                  v-model:value="completedFilters.demandTypeId"
+                  v-model:value="completedFilters.taskSubType"
                   placeholder="需求类型"
                   class="filter-select"
                   allowClear
                   @change="loadCompletedTasks"
                 >
                   <a-select-option
-                    v-for="type in demandTypes"
-                    :key="type.id"
-                    :value="type.id"
+                    v-for="subType in taskSubTypes"
+                    :key="subType.id"
+                    :value="subType.name"
                   >
-                    {{ type.name }}
+                    {{ subType.name }}
                   </a-select-option>
                 </a-select>
 
@@ -2861,6 +2861,9 @@ const workHoursPerDay = ref(9) // 默认9小时
 // 层级任务类型数据（用于级联选择器）
 const hierarchicalTaskTypes = ref<any[]>([])
 
+// 任务子类型列表（需求类型：新品/优化/视频/实拍等）
+const taskSubTypes = ref<any[]>([])
+
 // 🔥 接单部门列表（用于筛选和显示标签）
 const receivingDeptList = ref<Array<{ id: number; deptName: string }>>([])
 
@@ -2956,11 +2959,10 @@ const taskTypeCascaderOptions = computed(() => {
 const filters = reactive({
   status: '' as string, // 任务状态筛选
   taskTypeId: undefined as number | undefined,
-  demandTypeId: undefined as number | undefined,
+  taskSubType: undefined as string | undefined, // 需求类型（新品/优化/视频/实拍等）
   brandId: undefined as number | undefined,
   categoryId: undefined as number | undefined,
   platformId: undefined as number | undefined,
-  taskSubType: undefined as string | undefined,
   minScore: undefined as number | undefined,
   maxScore: undefined as number | undefined,
   keyword: undefined as string | undefined,
@@ -2975,7 +2977,7 @@ const completedFilters = reactive({
   keyword: undefined as string | undefined,
   sortBy: 'latest' as 'latest' | 'score',
   taskTypeId: undefined as number | undefined,
-  demandTypeId: undefined as number | undefined,
+  taskSubType: undefined as string | undefined, // 需求类型（新品/优化/视频/实拍等）
   brandId: undefined as number | undefined,
   categoryId: undefined as number | undefined,
   platformId: undefined as number | undefined,
@@ -3325,6 +3327,11 @@ const loadConfigs = async () => {
     if (response && response.data) {
       hierarchicalTaskTypes.value = response.data
     }
+    // 加载任务子类型（需求类型：新品/优化/视频/实拍等）
+    const subTypeResponse = await configApi.getEnabledTaskSubTypes()
+    if (subTypeResponse && subTypeResponse.data) {
+      taskSubTypes.value = subTypeResponse.data
+    }
     // 🔥 加载接单部门列表
     const deptResponse = await departmentApi.getDepartmentList()
     if (deptResponse && deptResponse.data) {
@@ -3382,7 +3389,6 @@ const loadTasks = async (forceReload = false) => {
     // 添加筛选条件
     if (filters.status) params.status = filters.status
     if (filters.taskTypeId) params.taskTypeId = filters.taskTypeId
-    if (filters.demandTypeId) params.demandTypeId = filters.demandTypeId
     if (filters.brandId) params.brandId = filters.brandId
     if (filters.categoryId) params.categoryId = filters.categoryId
     if (filters.platformId) params.platformId = filters.platformId
@@ -3483,7 +3489,7 @@ const handleFilterChange = () => {
 // 重置筛选
 const handleReset = () => {
   filters.taskTypeId = undefined
-  filters.demandTypeId = undefined
+  filters.taskSubType = undefined
   filters.brandId = undefined
   filters.categoryId = undefined
   filters.platformId = undefined
@@ -4384,7 +4390,7 @@ const handleCompletedFiltersReset = () => {
   completedFilters.keyword = undefined
   completedFilters.sortBy = 'latest'
   completedFilters.taskTypeId = undefined
-  completedFilters.demandTypeId = undefined
+  completedFilters.taskSubType = undefined
   completedFilters.brandId = undefined
   completedFilters.categoryId = undefined
   completedFilters.platformId = undefined