feat: browser proxy capture

### Preflight checklist

- [x] I searched [existing issues](https://github.com/ja7ad/hydra/issues?q=is%3Aissue) and this has not been proposed already.
- [x] I checked the [README](https://github.com/ja7ad/hydra/blob/main/README.md) and this is not already supported.

### Component

Browser extension (Chrome / Edge / Firefox / Safari)

### Problem

i need to manually add a proxy server after the extension captures the download link

### Proposed solution

idm has a feature where it automatically captures the current active proxy from the browser
if possible implement this feature from idm extension and add as temporary proxy server
and maybe have another checkbox in the extension to to toggle this feature on and off

### Alternatives considered

_No response_

### Platforms this should cover

- [x] Linux
- [ ] macOS
- [x] Windows
- [ ] Android / iOS (via `libhydra`)

### Additional context

_No response_

### Compatibility

- [ ] This changes existing behavior (flags, defaults, output format, or the C ABI).

### Contribution

- [ ] I'm willing to open a pull request implementing this.

The issue names no files, tests, or entry points. Start by locating the browser extension's download-link capture and proxy handling across Chrome, Edge, Firefox, and Safari. Done means the current browser proxy can be captured as a temporary proxy, with an extension setting to enable or disable the behavior on Linux and Windows.

Written by the indexing model from the issue text.