**建議 commit message：**
```
feat(order): add status filter and cursor-based pagination
- Add `status` query param to GET /orders (pending/shipped/completed)
- Replace offset pagination with cursor-based for consistent performance
- Return `next_cursor` in response payload for client-side navigation
BREAKING CHANGE: `offset` and `page` query params removed;
client must migrate to `cursor` param. See migration guide in CHANGELOG.
```
**備選 subject：**
1. `feat(order-api): support status filtering with cursor pagination`
2. `feat(orders): migrate to cursor pagination, add status filter`
3. `feat: enhance order listing API with filter and pagination`