Add comprehensive introduction video creation package for LLM4Hardware project

[Copilot]

This PR addresses the request to create an introduction video for the LLM4Hardware project poster. Since generating actual video with human voice requires external production tools, this implementation provides a complete video creation package with all necessary materials and automated generation tools.

What's Included

The new /videos/introduction_video/ directory contains:

📝 Core Production Materials

• Professional narration script (video_script.md) - 3-minute script with timing cues and visual directions
• Interactive HTML slide deck (slides.html) - Ready-to-use presentation with project branding
• Detailed production guide (production_guide.md) - Step-by-step instructions for video creation
• Visual design specifications (slide_content.md) - Complete style guide and slide content

🎨 Generated Visual Assets

• Component matrix showing all 12 research modules
• AI-enhanced design flow diagram
• Impact metrics visualizations
• Traditional vs LLM approach comparison charts

🎵 Audio Materials

• Section-by-section narration text files (6 segments)
• Complete narration script for voice recording
• Audio-visual synchronization timing guide
• Optional text-to-speech generation capability

🛠️ Automation Tools

• Python asset generator (generate_assets.py) - Creates professional visual assets using matplotlib
• TTS generator (tts_generator.py) - Converts script to audio files (optional)
• Comprehensive documentation with multiple production approaches

Key Features

• Multiple production options: From simple screen recording to professional video production
• Professional quality: Designed for conference presentations and academic use
• Modular design: Easy to update individual sections or adapt for other content
• Accessibility: Supports both technical and non-technical audiences
• Automated workflows: Python scripts generate consistent, high-quality assets

Usage

Users can choose from three approaches:

1. Quick Start: Use HTML slides + screen recording (2-3 hours)
2. Professional: Follow full production guide (4-6 days)
3. Semi-Automated: Use TTS and generated assets (1-2 days)

Video Specifications

• Duration: 3 minutes (180 seconds)
• Resolution: 1920x1080 (Full HD) minimum, 4K preferred
• Content: Project overview → 12 components → innovations → impact → call-to-action
• Style: Professional tech presentation with modern design system

The package provides everything needed to create a polished introduction video that showcases the LLM4Hardware project's scope and impact, perfect for use before presenting individual sub-modules.

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