enhance: ページslugに使用可能な文字を限定 (#15395)

* wip

* paramの正規表現で弾くように

* apiWithDialogを使用するように

* Update CHANGELOG.md

---------

Co-authored-by: kakkokari-gtyih <67428053+kakkokari-gtyih@users.noreply.github.com>

packages/backend/src/models/Page.ts

@@ -118,3 +118,5 @@ export class MiPage {
 		}
 	}
 }
+
+export const pageNameSchema = { type: 'string', pattern: /^[^\s:\/?#\[\]@!$&'()*+,;=\\%\x00-\x20]{1,256}$/.source } as const;