[Feature Request] /v0/users/{username}/collections是否想要支持tag筛选？

rt，好像没找到类似的openapi，就是类似个人页面上下面的操作


Start by locating the /v0/users/{username}/collections endpoint and any OpenAPI definition for it, then compare its available behavior with the personal page's tag operation shown in the issue image. Clarify the expected tag parameter and filtering semantics before implementation; done means the endpoint supports the agreed filter and its API documentation reflects it.

Written by the indexing model from the issue text.