refactor: organize CLI commands with category tags, add timeout flexibility

[MaojiaSheng]

This PR fixes: #1489

• Add command category tags [Data], [Interactive], [Status], [Admin], [Experimental]
• Add get_client_with_timeout() for custom timeout control
• Version command now shows both CLI and server versions
• Chat command falls back to config API key if VIKINGBOT_API_KEY not set
• Improve auth error messages for better context
• Reorganize command order with category comments

[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 1489 - Fully compliant Compliant requirements: Add command category tags [Data], [Interactive], [Status], [Admin], [Experimental] Reorganize command order with category comments

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🏅 Score: 90

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 Multiple PR themes Sub-PR theme: Improve auth error messages Relevant files: openviking/server/auth.py Sub-PR theme: Organize CLI commands with category tags and add timeout flexibility Relevant files: crates/ov_cli/src/main.rs

⚡ No major issues detected

[github-actions]

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[ZaynJarvis]

lgtm

[CLAassistant]

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