Summary

Adds Azure OpenAI as a supported provider in the LangChain4J integration layer.
Enterprise customers using Azure-hosted OpenAI deployments can now configure
dotAI without any code changes — only a providerConfig JSON update is required.

• Add langchain4j-azure-open-ai dependency
• Add azure_openai case to LangChain4jModelFactory switch
• Implement buildAzureOpenAiChatModel, buildAzureOpenAiEmbeddingModel, buildAzureOpenAiImageModel
• Pin Netty (4.1.118.Final) and Reactor (3.4.41) in BOM to resolve transitive version conflicts introduced by Azure SDK
• Add 3 unit tests in LangChain4jModelFactoryTest

Configuration

{
  "chat": {
    "provider": "azure_openai",
    "apiKey": "...",
    "endpoint": "https://my-company.openai.azure.com/",
    "deploymentName": "gpt-4o",
    "apiVersion": "2024-02-01",
    "maxTokens": 16384,
    "temperature": 1.0
  },
  "embeddings": {
    "provider": "azure_openai",
    "apiKey": "...",
    "endpoint": "https://my-company.openai.azure.com/",
    "deploymentName": "text-embedding-ada-002",
    "apiVersion": "2024-02-01"
  },
  "image": {
    "provider": "azure_openai",
    "apiKey": "...",
    "endpoint": "https://my-company.openai.azure.com/",
    "deploymentName": "dall-e-3",
    "apiVersion": "2024-02-01"
  }
}

Notes

• deploymentName is required for Azure (differs from model name). Falls back to model if not set.
• apiVersion maps to Azure's serviceVersion. Recommended: 2024-02-01.
• Netty/Reactor version pins are required for Azure SDK compatibility and do not affect existing behavior.

Related Issue

This PR fixes #35183
EPIC: dotAI Multi-Provider Support #33970