fix(mock): 修复主线数据不显示问题

- 调整 MSW handler 顺序，确保 /api/events/mainline 在 :eventId 之前匹配
  - 修复 generateDynamicNewsEvents 函数调用参数顺序错误
  - 添加主线事件模板，确保生成的事件能匹配主线关键词
  - 删除重复的 mainline handler 代码
  - 清理调试日志

src/views/Community/components/DynamicNews/layouts/MainlineTimelineView.js

@@ -630,7 +630,6 @@ const MainlineTimelineViewComponent = forwardRef(
         params.append("group_by", groupBy);
 
         const url = `${apiBase}/api/events/mainline?${params.toString()}`;
-        console.log("[MainlineTimelineView] 🔄 请求主线数据:", url);
 
         const response = await fetch(url);
         if (!response.ok) {
@@ -638,25 +637,22 @@ const MainlineTimelineViewComponent = forwardRef(
         }
 
         const result = await response.json();
-        console.log("[MainlineTimelineView] 📦 响应数据:", {
-          success: result.success,
-          mainlineCount: result.data?.mainlines?.length,
-          totalEvents: result.data?.total_events,
-          groupBy: result.data?.group_by,
-        });
+
+        // 兼容两种响应格式：{ success, data: {...} } 或 { success, mainlines, ... }
+        const responseData = result.data || result;
 
         if (result.success) {
           // 保存原始数据，排序在渲染时根据 sortBy 状态进行
-          setMainlineData(result.data);
+          setMainlineData(responseData);
 
           // 保存层级选项供下拉框使用
-          if (result.data.hierarchy_options) {
-            setHierarchyOptions(result.data.hierarchy_options);
+          if (responseData.hierarchy_options) {
+            setHierarchyOptions(responseData.hierarchy_options);
           }
 
           // 初始化展开状态（默认全部展开）
           const initialExpanded = {};
-          (result.data.mainlines || []).forEach((mainline) => {
+          (responseData.mainlines || []).forEach((mainline) => {
             const groupId = mainline.group_id || mainline.lv2_id || mainline.lv1_id;
             initialExpanded[groupId] = true;
           });