Following removal of Spring Boot's ConstructorBinding, convert record types
to regular POJOs to maintain JSON serialization. Update API classes:
- Convert FunctionTool and Function records to standard Java classes with
getters/setters
- Update test assertions to use getter methods instead of record accessors
- Fix failing tests in MiniMax, OpenAi and ZhiPu API implementations
This keeps core API models independent of Spring Boot while ensuring proper
serialization through standard Java beans.
- MistralAIApi FunctionTool ConstructorBinding removal changes
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