fix: include base_path in dev-server websocket URL

[mvanhorn]

Summary

fix: include base_path in dev-server websocket URL

Closes #5584

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AI was used for assistance.

[NoeTerrier]

Thanks for the fix !

I have two questions tho:

1. What were the reasons behind the changes made to the “package/cli” directory in connection with this issue?
2. Just to address a general question I have: when building for release, is the hot reloading expected at all? 🤔

[mvanhorn]

Good catch. The packages/cli change (and a small fullstack-core response-header tweak) were unrelated to this fix and got bundled in by mistake — I've stripped the branch down to just the websocket URL change, so the PR is now a single file (packages/web/src/devtools.rs). Those other bits were standalone improvements and can come back as their own focused PRs.

On the release question: make_ws only connects to the dev server's /_dioxus endpoint, which is served by dx serve. Release builds don't run that dev server, so there's nothing for it to connect to — hot reloading isn't expected in release. This base_path change only matters for dx serve sitting behind a proxy under a sub-path.