Use Spring AI with Azure OpenAI

https://github.com/Azure-Samples/Java-AI-Based-Content-Generator/blob/main/middleware/src/main/java/com/example/content_generator/aiservice/controller/ContentController.java#L22

The middleware app uses REST API calls into Azure OpenAI Service. Given that these are Spring Boot apps, we suggest that the app use Spring AI module to interact with Azure OpenAI Service. Spring AI is built on top of our Azure Java SDK for Azure OpenAI.

Reference - https://github.com/spring-projects/spring-ai

从 middleware/src/main/java/com/example/content_generator/aiservice/controller/ContentController.java 的第 22 行开始，查看链接的 Spring AI 参考资料。使用 Spring AI 替换 middleware 通过 REST API 与 Azure OpenAI 的交互，然后验证内容生成流程仍能像以前一样工作。

由索引模型根据 Issue 内容生成。