feat: 全部列表页统一分页 + WorkProcess集成现有服务

- WorkProcess/Termination/Evidence/Contracts/Policies/Templates 添加 Pagination 组件
- 后端 getDrafts/getPolicies/enterprise-template 路由添加分页支持（可选参数，向后兼容）
- work-process.service CONFIRM case 修正：移除不存在的 probationEndDate 字段
- 新增 migration_add_three_tables.sql 增量迁移文件

frontend/src/pages/Templates.tsx

@@ -9,6 +9,7 @@ import Button from '../components/ui/Button'
 import { Input, Label, Select } from '../components/ui/Input'
 import Modal from '../components/ui/Modal'
 import EmptyState from '../components/ui/EmptyState'
+import Pagination from '../components/ui/Pagination'
 
 const CATEGORY_LABELS: Record<string, string> = {
   CONTRACT: '合同',
@@ -303,6 +304,8 @@ function SystemTemplates() {
 function EnterpriseTemplates() {
   const queryClient = useQueryClient()
   const [category, setCategory] = useState<string>('')
+  const [page, setPage] = useState(1)
+  const [pageSize, setPageSize] = useState(20)
   const [showEdit, setShowEdit] = useState(false)
   const [editItem, setEditItem] = useState<any>(null)
   const [form, setForm] = useState({ name: '', category: 'CONTRACT', description: '', content: '' })
@@ -310,14 +313,17 @@ function EnterpriseTemplates() {
   const [rendered, setRendered] = useState('')
   const [variables, setVariables] = useState<Record<string, string>>({})
 
-  const { data: list, isLoading } = useQuery<any>({
-    queryKey: ['enterprise-templates', category],
+  const { data: listData, isLoading } = useQuery<any>({
+    queryKey: ['enterprise-templates', category, page, pageSize],
     queryFn: async () => {
-      const params = category ? `?category=${category}` : ''
-      const res = await api.get(`/enterprise-templates${params}`) as any
+      const params: any = { page, pageSize }
+      if (category) params.category = category
+      const res = await api.get('/enterprise-templates', { params }) as any
       return res.data
     },
   })
+  const list = listData?.items || []
+  const total = listData?.total || 0
 
   const { data: detail } = useQuery<any>({
     queryKey: ['enterprise-template-detail', selected?.id],
@@ -459,6 +465,13 @@ function EnterpriseTemplates() {
           ))}
         </div>
       )}
+      <Pagination
+        page={page}
+        pageSize={pageSize}
+        total={total}
+        onPageChange={setPage}
+        onPageSizeChange={(s) => { setPageSize(s); setPage(1) }}
+      />
 
       {/* 编辑弹窗 */}
       <Modal open={showEdit} onClose={() => setShowEdit(false)} title={editItem ? '编辑模板' : '新建模板'} size="lg">