feat: 区分待解聘/待离职+撤回功能

1. 花名册列表区分「待解聘」(amber)和「待离职」(blue)
2. 未到日期的解聘/离职记录可撤回，撤回后删除记录并恢复在职状态
3. 后端新增 DELETE /termination/:id/revoke 接口
4. 花名册列表返回 latestTerminationType 和 latestTerminationId

frontend/src/pages/Roster.tsx

@@ -51,6 +51,14 @@ export default function Roster() {
     },
   })
 
+  const revokeMutation = useMutation({
+    mutationFn: (recordId: string) => api.delete(`/termination/${recordId}/revoke`),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['roster'] })
+      queryClient.invalidateQueries({ queryKey: ['dashboard'] })
+    },
+  })
+
   const filtered = employees?.filter((e: any) =>
     !search || e.name.includes(search) || e.department.includes(search)
   ) || []
@@ -156,7 +164,22 @@ export default function Roster() {
                         </button>
                       )}
                       {e.hasTermination && e.status === 'ACTIVE' && (
-                        <span className="text-xs text-gray-400">待离职</span>
+                        <div className="flex items-center justify-center gap-2">
+                          <span className={`text-xs ${e.latestTerminationType === 'RESIGNATION' ? 'text-blue-600' : 'text-amber-600'}`}>
+                            {e.latestTerminationType === 'RESIGNATION' ? '待离职' : '待解聘'}
+                          </span>
+                          <button
+                            className="text-xs text-gray-400 hover:text-danger"
+                            onClick={(ev) => {
+                              ev.stopPropagation()
+                              if (e.latestTerminationId && confirm(`确认撤回${e.latestTerminationType === 'RESIGNATION' ? '离职' : '解聘'}记录？`)) {
+                                revokeMutation.mutate(e.latestTerminationId)
+                              }
+                            }}
+                          >
+                            撤回
+                          </button>
+                        </div>
                       )}
                     </td>
                   </tr>