Fix Spring Boot 4.0.1 compatibility issues

[Copilot]

Spring Boot 4.0.1 removed/relocated several classes and APIs, causing compilation failures in configuration and test classes.

Configuration Changes

DatabaseStartupConfig - Replaced removed EntityManagerFactoryDependsOnPostProcessor:

// Before: EntityManagerFactoryDependsOnPostProcessor (removed in 4.0)
@Bean
public static EntityManagerFactoryDependsOnPostProcessor databaseStartupDependency() {
    return new EntityManagerFactoryDependsOnPostProcessor("databaseStartupValidator");
}

// After: Custom BeanFactoryPostProcessor
@Bean
public static BeanFactoryPostProcessor entityManagerFactoryDependsOnPostProcessor() {
    return beanFactory -> {
        String[] beanNames = beanFactory.getBeanNamesForType(EntityManagerFactory.class);
        for (String beanName : beanNames) {
            beanFactory.getBeanDefinition(beanName).setDependsOn("databaseStartupValidator");
        }
    };
}

SecurityConfig - Removed deprecated AntPathRequestMatcher.antMatcher() static method:

// Before
.requestMatchers(antMatcher("/webjars/**")).permitAll()

// After  
.requestMatchers("/webjars/**").permitAll()

MethodSecurityConfig - Migrated from deprecated @EnableGlobalMethodSecurity to @EnableMethodSecurity:

// Before
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class MethodSecurityConfig extends GlobalMethodSecurityConfiguration {
    @Override
    protected MethodSecurityExpressionHandler createExpressionHandler() { ... }
}

// After
@EnableMethodSecurity
public class MethodSecurityConfig {
    @Bean
    public MethodSecurityExpressionHandler methodSecurityExpressionHandler() { ... }
}

Test Changes

WebTest - Updated @AutoConfigureMockMvc import to new modular package:

// Before: org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
// After:  org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc

Dependencies:

• Added spring-boot-starter-webmvc-test (required for modular test support in 4.0)
• Updated springdoc-openapi-starter-webmvc-ui to 3.0.0

Known Issue

WebTest has 4 failures due to springdoc-openapi 3.0.0 incompatibility with Spring Boot 4.0's restructured HATEOAS autoconfiguration. Main application code compiles and runs successfully.

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