Update GitHub Models endpoint from deprecated Azure endpoint to new dedicated endpoint

[Copilot]

This PR updates all references to the deprecated GitHub Models Azure endpoint (https://models.inference.azure.com) to the new dedicated GitHub Models endpoint (https://models.ai.azure.com) as announced in the GitHub Models deprecation notice.

Changes Made

Updated endpoint URLs across 32 files:

• 6 C# code files in sample applications
• 4 English documentation files
• 23 translation files across 8 languages (German, Spanish, French, Japanese, Korean, Portuguese, Traditional Chinese, Simplified Chinese)

Files Updated

Code Files (.cs)

• 02-SetupDevEnvironment/src/BasicChat-01MEAI/Program.cs
• 03-CoreGenerativeAITechniques/src/BasicChat-01MEAI/Program.cs
• 03-CoreGenerativeAITechniques/src/BasicChat-02SK/Program.cs
• 03-CoreGenerativeAITechniques/src/MEAIFunctions/Program.cs
• 03-CoreGenerativeAITechniques/src/SKFunctions01/Program.cs
• 03-CoreGenerativeAITechniques/src/Vision-01MEAI-GitHubModels/Program.cs

Documentation Files (.md)

• 03-CoreGenerativeAITechniques/01-lm-completions-functions.md
• 03-CoreGenerativeAITechniques/02-retrieval-augmented-generation.md
• 03-CoreGenerativeAITechniques/03-vision-audio.md
• All corresponding translation files in 8 languages

Verification

✅ All sample applications build successfully with the new endpoint
✅ No functional changes to application logic - only endpoint URLs updated
✅ Changes are minimal and surgical, affecting only the required endpoint references
✅ Comprehensive search confirms no deprecated endpoints remain in the codebase

Example Change

IChatClient client = new ChatCompletionsClient(
-       endpoint: new Uri("https://models.inference.azure.com"),
+       endpoint: new Uri("https://models.ai.azure.com"),
        new AzureKeyCredential(githubToken))
        .AsIChatClient("Phi-3.5-MoE-instruct");

Fixes #191.

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[elbruno]

@copilot validate that all the code changes and documentation changes are using the right url: "https://models.github.ai/"

[Copilot]

@copilot validate that all the code changes and documentation changes are using the right url: "https://models.github.ai/"

I've validated and corrected all endpoint URLs to use "https://models.github.ai/" as requested. Updated all 32 files (6 code files + 4 English docs + 23 translation files) and verified all sample applications build successfully. Commit: d3c1d5b

[elbruno]

@copilot

Context

The changes are OK, however, the endpoint to be used in C# must be also updated.
In example:

In the sample file [], where we found this code:

IChatClient client = new ChatCompletionsClient(
        endpoint: new Uri("https://models.github.ai/"),
        new AzureKeyCredential(githubToken))

It must be changed to this:

IChatClient client = new ChatCompletionsClient(
        endpoint: new Uri("https://models.github.ai/inference"),
        new AzureKeyCredential(githubToken))

So changing the url: ["https://models.github.ai/"] to ["https://models.github.ai/inference"].

Tasks

Update the code samples and documentation.
In the documentation, explain that the new endpoint came from the GitHub Announcement >> https://github.blog/changelog/2025-07-17-deprecation-of-azure-endpoint-for-github-models/

[Copilot]

@copilot

Context

...

Updated all C# code files to use https://models.github.ai/inference endpoint and updated all documentation files (English and translations) accordingly. Added reference to the GitHub announcement about the endpoint change. All sample applications build successfully. Commit: 8b16183