Add version information to the ui

[bene64]

It would be great, if the same information from ./proxy --version would also be available in the web UI. Maybe in the footer, right below the GitHub link.

Use case

This would it make easy to see, if I'm running on an recent version.

Example

Implementation note

I'm a total go novice, so I couldn't get that over the finish line (yet).

A hardcoded string from dashboard.go over templates.go into footer.html works. But I am unsure how to nicely pass it from main.go.
Passing it as constructor of Server could work, but I don't know if this is go-like enough. Happy to get any pointers into the right direction here.

[WilliamK112]

I'd like to work on this. I'll pass the existing build version and commit into the server explicitly, expose them through the shared layout, render the same build information in the footer, and add focused rendering/handler coverage.

[WilliamK112]

Implemented in #257. The PR passes the existing linker-injected version and commit through an explicit server build-info value, renders it from the shared footer layout on every UI page, and adds constructor plus end-to-end dashboard coverage. Local go test ./..., go test -race ./..., go vet ./..., and the repository-pinned golangci-lint all pass. The fork-triggered Actions runs are currently waiting for maintainer approval.