feat: Backend API for the Activity Log

[arvid-e]

https://redmine.weseek.co.jp/issues/171499
┗ https://redmine.weseek.co.jp/issues/171501

GET _api/v3/user-activities/

Response

{
    "serializedPaginationResult": {
        "docs": [
            {
                "user": {
                    "_id": "68b67e2a149f8bd7ae01be8d",
                    "name": "admin",
                    "username": "admin",
                    "imageUrlCached": "/images/icons/user.svg"
                },
                "_id": "68e37c45f19a37f3a0617c33",
                "action": "PAGE_UPDATE",
                "createdAt": "2025-10-06T08:22:29.976Z",
                "target": "68e37c3ef19a37f3a0617b31",
                "targetModel": "Page"
            },
            {
                "user": {
                    "_id": "68b67e2a149f8bd7ae01be8d",
                    "name": "admin",
                    "username": "admin",
                    "imageUrlCached": "/images/icons/user.svg"
                },
                "_id": "68d4ccde3aa503a3ea9b75b6",
                "action": "PAGE_UPDATE",
                "createdAt": "2025-09-25T05:02:22.531Z",
                "target": "68d4ccd43aa503a3ea9b74bc",
                "targetModel": "Page"
            }
        ],
        "totalDocs": 2,
        "limit": 20,
        "offset": 0,
        "page": 1,
        "totalPages": 1,
        "hasPrevPage": false,
        "hasNextPage": false
    }
}

[yuki-takei]

キャストしなくても返り値は string 型のはず

[yuki-takei]

import type { Request } from 'express'; と generics を使って、limit と offset の as string を書かなくて済むようにしてください