OptimizingProfileURLstoFunctionExclusivelywithUsernames,EliminatingtheNeedforUserIDs

Fixes #1356

Changes proposed in this pull request:
Drop support for ID in profile urls. Only accept username.

Reviewers should focus on:
This is based on one of the proposal discussed in the issue. However I'm not sure how to handle errors, as "not found" is now an empty list instead of a native 404.

Also the fact that

is now a list could break some extensions that read the payload directly. I'm thinking of the SEO extension which I have not tested in combination with this.

Confirmed

• [x] Frontend changes: tested on a local Flarum installation.


• [ ] Backend changes: tests are green (run
  

  1	composer test

  ).

Required changes:

• [ ] Related documentation PR: (Remove if irrelevant)


• [ ] Related core extension PRs: (Remove if irrelevant)

该提问来源于开源项目：flarum/core