[feature] Django admin view for Batch command model

[dee077]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Closes #1345.

Description of Changes

• Add Django admin workflow for mass command execution with a custom change form
• Improve admin changelist with better column layout, colored status, and link display
• Used label (mandatory) and notes (optional) fields in the BatchCommand admin view.
• Add affected_devices computed field to BatchCommand
• Polish UI consistency with CSS updates for status indicators

Screenshot

Screencast.from.2026-07-03.00-47-45.webm

Todo:

• Polish code
• Test extensively with all edge cases
• Write tests
• Write docs

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✨ Finishing Touches

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• Commit unit tests in branch feature/1345-mass-command-admin-workflow

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