Fix ckpool quick link host generation

[0xjc65eth]

Summary

• generate ckpool quick links from the matched pool host instead of adding the solostats subdomain
• fixes links such as eusolo.ckpool.org so they point to /users/<address> on the same ckpool host
• keeps support for solo, solo4, solo6, eusolo, and ausolo variants

Fixes #596

Testing

• git diff --check
• npm run build

Note: the frontend build still reports the existing initial bundle budget warning.

[0xjc65eth]

Closing this for now to reduce maintainer review load, per feedback from @mutatrum. I am keeping #1705 open as the single focused PR because it is small, UI-only, and already has an ack. Happy to revisit this later only if maintainers ask for it. Thanks for the feedback and for maintaining the project.