Phanpy sends large numbers of OPTIONS HTTP requests when making Mastodon API calls

**Describe the bug**
- Which site: phanpy.social
- Which site version: 2024.07.01.5e9165b
- Which instance: princess.industries (running GotoSocial 0.17-dev)

**To Reproduce**
1. Open browser dev tools or an HTTP proxy tool. Filter to XHR if possible.
2. Open Phanpy.
3. Interact with the app: scroll the timeline, view a thread, view a user, etc.
4. See about one `OPTIONS` request before almost any other API call HTTP request.

**Expected behavior**
Phanpy should not send so many `OPTIONS` requests. This causes unnecessary network traffic and unnecessary work for the server, and might result in Phanpy (and other clients sharing the same IP, including other Phanpy instances) getting rate limited.

**Screenshots**

**Desktop:**
- OS: macOS 14
- Browser: Firefox
- Version: 127.0.2

**Additional context**
I'm guessing this is part of Mastodon API feature detection, but it shouldn't be necessary to preflight literally every API route. Even caching the results for a given API route for a few minutes would help a lot.

Reproduce the report using browser developer tools or an HTTP proxy while scrolling the timeline, viewing a thread, and viewing a user. Trace the Mastodon API requests and their OPTIONS requests; done means normal API interactions no longer generate an unnecessary preflight before almost every call without breaking those requests.

Written by the indexing model from the issue text.