[FEAT cloudctl] - Add prompt command for shell prompt integration

[onuryilmaz]

User Story

As a cloudctl user, I want to display my active context and namespace in my shell prompt, so I always know which cluster I am targeting.

Description

cloudctl prompt [--no-color] prints [context|namespace] with color coding for use in PS1/PROMPT: bold green for QA contexts (containing qa-), bold white on red background for production. --no-color disables ANSI codes for scripting.

Acceptance Criteria

• Prints [context|namespace] to stdout
• QA contexts (containing qa-) rendered in bold green
• Non-QA contexts rendered in bold white on red background
• --no-color flag disables all ANSI color codes

Reference Issues

Epic: #70

[github-actions]

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