build: add VERSION-based release workflow
Introduce VERSION as the app version source of truth and add make bump-patch to increment VERSION, commit, and create a matching vX.Y.Z tag. Wire VERSION into build outputs by injecting it into webterm.Version for make build-go and Docker image builds, and include VERSION in Docker build context. Also remove the visible dashboard container count subtitle while keeping count updates in browser console logs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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