Refactor code to improve readability and maintainability

- In AdvancedAIPromptSolver.java, removed unnecessary logging statement and fixed a typo in variable name.
- In SourceCodeRagSolver.java, updated service name to match the correct module name.
- In application.properties, added Eureka configuration for service discovery.

src/main/resources/application.properties

@@ -33,3 +33,5 @@ spring.ai.vectorstore.neo4j.index-name:spring-ai-document-index
 spring.main.allow-bean-definition-overriding=true
 logging.level.org.springframework.ai.chat.client.advisor=DEBUG
 
+eureka.client.serviceUrl.defaultZone: ${EUREKA_URI:http://localhost:8761/eureka}
+eureka.instance.preferIpAddress: true