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/routes/enterprise-template.routes.ts

@@ -15,14 +15,21 @@ function extractVariables(content: string): string[] {
 router.get('/', authMiddleware, async (req: AuthRequest, res: Response, next: NextFunction) => {
   try {
     const { category, search } = req.query
+    const page = parseInt(req.query.page as string) || 1
+    const pageSize = Math.min(parseInt(req.query.pageSize as string) || 20, 200)
     const where: any = { orgId: req.user!.orgId, status: 'ACTIVE' }
     if (category) where.category = category
     if (search) where.name = { contains: String(search) }
-    const items = await (prisma as any).enterpriseTemplate.findMany({
-      where,
-      orderBy: { createdAt: 'desc' },
-    })
-    res.json({ success: true, data: items })
+    const [items, total] = await Promise.all([
+      (prisma as any).enterpriseTemplate.findMany({
+        where,
+        orderBy: { createdAt: 'desc' },
+        skip: (page - 1) * pageSize,
+        take: pageSize,
+      }),
+      (prisma as any).enterpriseTemplate.count({ where }),
+    ])
+    res.json({ success: true, data: { items, total, page, pageSize, totalPages: Math.ceil(total / pageSize) } })
   } catch (err) {
     next(err)
   }