The Microsoft.Extensions.AI integration section in the Ollama documentation was using deprecated methods that are no longer recommended in .NET Aspire 9.0. The image in the issue shows these deprecated methods:

builder.AddOllamaSharpChatClient("llama32");
builder.AddOllamaApiClient("llama32").AddChatClient();

This PR updates the documentation to use the current recommended patterns that are consistent with other .NET Aspire AI integrations (Azure OpenAI, Azure AI Inference).

Changes Made

• ✅ Removed deprecated methods: Eliminated AddOllamaSharpChatClient examples
• ✅ Updated to current pattern: Now uses AddOllamaClientApi("llama").AddChatClient() following the same pattern as Azure OpenAI integration
• ✅ Added embedding support: Included AddEmbeddingGenerator() examples for complete Microsoft.Extensions.AI coverage
• ✅ Enhanced keyed services: Added comprehensive section for registering multiple AI client instances with different connection names
• ✅ Improved examples: Updated dependency injection examples to show both chat and embedding clients

New Pattern

For chat clients:

builder.AddOllamaClientApi("llama")
       .AddChatClient();

For embedding generators:

builder.AddOllamaClientApi("llama")
       .AddEmbeddingGenerator();

For keyed services:

builder.AddOllamaClientApi("chat")
       .AddKeyedChatClient("chat");
builder.AddOllamaClientApi("embeddings")
       .AddKeyedEmbeddingGenerator("embeddings");

The updated documentation now follows the established pattern used across all .NET Aspire AI integrations and reflects the changes introduced in .NET Aspire Community Toolkit 9.0 with OllamaSharp 4.

Fixes #4131.

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