Customer Support Chat Service

Problem/Feature Description

A small e-commerce company wants to add an AI-powered customer support assistant to their existing backend platform. Their backend runs on Quarkus and the team has been asked to expose a new REST endpoint (POST /support/chat) that accepts a plain-text customer message and returns a plain-text response from an AI assistant.

The AI assistant should be set up as a dedicated service component with a system persona that frames it as a helpful customer support agent. The team has settled on Anthropic's Claude as the model provider. The application should be structured following Quarkus CDI conventions so the AI service can be reused across the application later.

Output Specification

Produce a complete, compilable Maven project with the following files:

• pom.xml — Maven project descriptor with all required dependencies
• src/main/java/.../SupportAiService.java — the AI service interface
• src/main/java/.../SupportResource.java — the REST endpoint class
• src/main/resources/application.properties — model provider configuration

The package name and group/artifact IDs are your choice. The project should be ready to run with mvn quarkus:dev after an API key is provided.

Write a brief SETUP.md explaining how to start the application in development mode and where the Dev UI can be accessed.