Add lesson 07 on image and video generation with new Azure OpenAI models (gpt-image-1 and sora)

[Copilot]

This PR adds a new comprehensive lesson (07) to the Core Generative AI Techniques section covering the latest Azure OpenAI models for visual content generation:

What's Added

New Lesson 07: Image and Video Generation with New Azure OpenAI Models

• Image Generation with gpt-image-1: Covers the enhanced image generation model with improved prompt understanding and quality
• Video Generation with Sora: Comprehensive guide on using the Sora model for text-to-video generation
• Practical Code Examples: Includes real C# code samples extracted from existing source projects:
  • REST API approach for Sora video generation
  • AzureSoraSDK integration examples
  • Enhanced image generation with gpt-image-1

Updated Navigation and Structure

• Updated main lesson 3 readme to include the new lesson in proper order
• Added new capability (🎬 Image and video generation with new models) to the learning objectives
• Fixed lesson navigation flow to ensure proper progression through content

Key Features of the New Lesson

• Step-by-step implementation guides for both image and video generation
• Configuration and setup instructions following existing lesson patterns
• Code samples showing:
  • Azure OpenAI client setup for gpt-image-1
  • Video job creation and polling with Sora
  • Asynchronous video processing and download
  • Error handling and best practices
• Comparison of capabilities between new and previous models
• Resource links to official documentation and SDKs

The lesson follows the established format of other lessons in the repository, including practical examples, troubleshooting guidance, and proper linking to related content.

Fixes #174.

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[elbruno]

@copilot Add the necessary links to the AzureSoraSDK in the new file. Use the

• Official Repo: https://github.com/DrHazemAli/AzureSoraSDK

[Copilot]

@copilot Add the necessary links to the AzureSoraSDK in the new file. Use the

• Official Repo: https://github.com/DrHazemAli/AzureSoraSDK

Added the official AzureSoraSDK repository links to the lesson file. The main repository link now appears prominently in the AzureSoraSDK section and in the additional resources. Commit fac94d8.