feat: Add HTML log viewer for agent interaction visualization

[Julie3399]

• Add llm_log_to_html.py for converting agent logs to interactive HTML
• Add PromptLogger utility for automatic prompt logging
• Include comprehensive usage guide and examples
• Add run_tbench_task_example.py showing real-world integration

This feature enables better visualization and analysis of agent-LLM interactions, making it easier to debug and understand agent behavior in any CAMEL application.

Features:

• Interactive HTML viewer with collapsible sections
• Search functionality for quick navigation
• Color-coded message roles for clarity
• Statistics dashboard
• Zero external dependencies (uses Python stdlib only)

Examples provided:

• Basic usage examples (example_usage.py)
• Real-world Terminal Bench integration (run_tbench_task_example.py)

🤖 Generated with Claude Code

Description

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• I have updated the tests accordingly (required for a bug fix or a new feature)
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• I have added examples if this is a new feature

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✨ Finishing touches

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• Create PR with unit tests
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• Commit unit tests in branch feat/html-log-viewer

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