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

backend/src/services/policy.service.ts

@@ -73,24 +73,31 @@ export async function createPolicy(orgId: string, userId: string, data: { title:
 /**
  * 获取制度列表（含阅读签收统计）
  */
-export async function getPolicies(orgId: string, status?: string) {
+export async function getPolicies(orgId: string, status?: string, page?: number, pageSize?: number) {
   const where: any = { orgId }
   if (status) where.status = status
-  const [policies, totalEmployees] = await Promise.all([
+  const hasPagination = page && pageSize
+  const [policies, totalEmployees, total] = await Promise.all([
     prisma.policyDocument.findMany({
       where,
       orderBy: { updatedAt: 'desc' },
       include: {
         _count: { select: { readRecords: true } },
       },
+      ...(hasPagination ? { skip: (page! - 1) * pageSize!, take: pageSize! } : {}),
     }),
     prisma.employee.count({ where: { orgId, status: 'ACTIVE' } }),
+    hasPagination ? prisma.policyDocument.count({ where }) : Promise.resolve(0),
   ])
-  return policies.map(p => ({
+  const items = policies.map(p => ({
     ...p,
     readCount: p._count?.readRecords || 0,
     totalEmployees,
   }))
+  if (hasPagination) {
+    return { items, total, page, pageSize, totalPages: Math.ceil(total / pageSize!) }
+  }
+  return items
 }
 
 /**