feat: standardize bumpversion command across all repos

[mairas]

Problem

Currently, version bumping is inconsistent across repositories:

• Some repos have ./run bumpversion (cockpit-apt, container-packaging-tools)
• Some repos have ./run bump-version (halos-marine-containers)
• Most repos have no version bump command at all

This makes it difficult to automate version bumps across the workspace.

Proposed Solution

1. Standardize on a single command name: ./run bumpversion [patch|minor|major]
2. Add this command to all repos that have a VERSION file
3. Use bump-my-version (or equivalent) consistently
4. Handle repo-specific files (VERSION, pyproject.toml, package.json, Cargo.toml, etc.)

Affected Repositories

• cockpit-apt (has bumpversion, works)
• container-packaging-tools (has bumpversion, works)
• halos-marine-containers (has bump-version, needs rename)
• halos-core-containers (has .bumpversion.cfg but no run command)
• halos-cockpit-config (no bumpversion)
• halos-homarr-branding (no bumpversion)
• halos-metapackages (no bumpversion)
• halos-mdns-publisher (no bumpversion)
• homarr-container-adapter (no bumpversion)

Implementation Requirements

Follow docs/IMPLEMENTATION_CHECKLIST.md during implementation.

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