Phanpy decoding webfinger URLs

### Site

phanpy.social

### Version

2024.12.28.119d4b0

### Instance

social.hardfork.ngo

### Browser

- Safari on Sonoma

### Bug description

When Phanpy fetches a webfinger account that resolves to a URL encoded string, it decodes the URL before fetching the actor. For example, if the actor resolves to `https://example.com/test%253example`, Phanpy will fetch `https://example.com/test:example` instead of fetching the encoded URL verbatim.

### To reproduce

_No response_

### Expected behavior

Fetch the encoded URL verbatim.

### Other

_No response_

Start by tracing Phanpy’s WebFinger account-resolution flow to the point where the actor URL is fetched, using the example URL containing encoded characters. Confirm the current decoding behavior and make the fetch preserve the encoded URL verbatim; done means the actor request uses the original encoded URL.

Written by the indexing model from the issue text.