fix(announcement-form): 修复首次加载下拉无数据问题

src/components/announcement/announcement-form-mixin.js

@@ -697,6 +697,13 @@ export default {
           if (this.formData && this.formData.categoryId != null && this.formData.categoryId !== '') {
             this.formData.categoryId = String(this.formData.categoryId);
           }
+          // 修复首次加载下拉无数据：同步更新表单配置中分类列的dicData，触发Avue响应式渲染
+          if (this.formOption && Array.isArray(this.formOption.column)) {
+            const idx = this.formOption.column.findIndex(col => col && col.prop === 'categoryId');
+            if (idx !== -1) {
+              this.$set(this.formOption.column[idx], 'dicData', this.categoryOptions.slice());
+            }
+          }
         }
       } catch (error) {
         console.error('加载分类选项失败:', error);