Fix: Add Spring Boot 3.x autoconfiguration support

[cpage-pivotal]

Summary

• Adds Spring Boot 3.x autoconfiguration support to the spring-ai-claude-agent module
• Fixes compatibility issue with Spring Boot 3.5.0 applications

Problem

When running samples with Spring Boot 3.5.0 (e.g., getting-started-hello-world), the application failed to start with:

Error creating bean with name 'demo': Unsatisfied dependency expressed through method 'demo' parameter 0: 
No qualifying bean of type 'org.springaicommunity.agents.client.AgentClient$Builder' available

Root Cause

Spring Boot changed its autoconfiguration discovery mechanism in version 3.x:

• Spring Boot 2.x: Uses META-INF/spring.factories
• Spring Boot 3.x: Uses META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

The spring-ai-claude-agent module only had the Spring Boot 2.x format, causing Spring Boot 3.x to not discover ClaudeAgentAutoConfiguration and SandboxAutoConfiguration. Without these, the required beans were never created.

Solution

Added META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports with the two autoconfiguration classes:

• org.springaicommunity.agents.claude.autoconfigure.ClaudeAgentAutoConfiguration
• org.springaicommunity.agents.claude.autoconfigure.SandboxAutoConfiguration

The existing spring.factories file is retained for backward compatibility with Spring Boot 2.x applications.

Test Plan

• Verify the autoconfiguration file is included in the built jar
• Test that getting-started-hello-world sample starts successfully with Spring Boot 3.5.0
• Verify AgentClient.Builder bean is properly injected
• Confirm backward compatibility with Spring Boot 2.x (if applicable)

Impact

• Enables Spring Boot 3.x compatibility for the Claude agent module
• No breaking changes - maintains Spring Boot 2.x compatibility
• Other agent model modules (Gemini, SWE-bench) may need similar updates