refactor: 统一分页组件和UI优化

- 使用公共Pagination组件统一各页面的分页逻辑
- 优化exceptions页面异常列表展示
- 简化settings/rules页面规则管理
- 后端tasks.py增加分页参数支持

frontend/app/(dashboard)/tasks/[id]/mapping/page.tsx

@@ -439,12 +439,12 @@ export default function MappingPage() {
     [toast]
   );
 
-  // 确认并进入下一步
+  // 确认并进入下一步 - 跳转到对账结果页面
   const handleConfirmAndNext = useCallback(async () => {
     try {
       setLoading(true);
       toast.success("字段映射已确认，正在进入对账...");
-      router.push(`/tasks/${taskId}/reconciliation`);
+      router.push(`/tasks/${taskId}/result`);
     } catch {
       toast.error("操作失败");
     } finally {
@@ -475,7 +475,7 @@ export default function MappingPage() {
         className="flex items-center justify-between"
       >
         <div className="flex items-center gap-4">
-          <Button variant="ghost" size="icon" onClick={() => router.push("/dashboard")} className="hover:bg-muted">
+          <Button variant="ghost" size="icon" onClick={() => router.push("/tasks")} className="hover:bg-muted">
             <ArrowLeft className="h-4 w-4" />
           </Button>
           <div>