fix: preserve legacy report record source accuracy

src/api/adminApi.ts

@@ -577,7 +577,7 @@ export type ReportRecord = DictionaryItem & {
   statusBefore?: string | null;
   statusAfter?: string | null;
   reason?: string | null;
-  sourceEntry?: 'system' | 'enterprise_signature' | 'report_task' | 'channel_report';
+  sourceEntry?: 'system' | 'legacy' | 'enterprise_signature' | 'report_task' | 'channel_report';
   channel?: AdminChannel;
   task?: ReportTask;
 };

src/apps/admin/AdminReportRecordsPage.tsx

@@ -25,7 +25,7 @@ const actionLabel: Record<string, string> = {
 };
 
 const sourceEntryLabel: Record<string, string> = {
-  enterprise_signature: '企业签名修改', report_task: '报备任务修改', channel_report: '通道信息修改', system: '系统自动处理',
+  enterprise_signature: '企业签名修改', report_task: '报备任务修改', channel_report: '通道信息修改', system: '系统自动处理', legacy: '历史记录（入口未记录）',
 };
 
 function translateStatus(value?: string | null) {