Issue #7: Fix MCP BE Authorization issue with MCP server

package org.etsi.osl.mcp.backend.configuration;

import org.springaicommunity.mcp.security.client.sync.AuthenticationMcpTransportContextProvider;

import org.springaicommunity.mcp.security.client.sync.oauth2.http.client.OAuth2AuthorizationCodeSyncHttpRequestCustomizer;

import org.springframework.ai.mcp.customizer.McpSyncClientCustomizer;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.security.oauth2.client.OAuth2AuthorizedClientManager;

import org.springframework.security.oauth2.client.registration.ClientRegistrationRepository;

import org.springframework.security.oauth2.client.registration.InMemoryClientRegistrationRepository;

import io.modelcontextprotocol.client.transport.customizer.McpSyncHttpClientRequestCustomizer;

/**

 * @author Daniel Garnier-Moiroux

 */

    // Disabled OAuth2 customization for MCP client - not needed for JWT-based API

    // The MCP server connection doesn't need OAuth2 authentication

    // @Bean

    // McpSyncHttpClientRequestCustomizer requestCustomizer(OAuth2AuthorizedClientManager oAuth2AuthorizedClientManager,

    //         ClientRegistrationRepository clientRegistrationRepository) {

    //     var registrationId = findUniqueClientRegistration(clientRegistrationRepository);

    //     return new OAuth2AuthorizationCodeSyncHttpRequestCustomizer(oAuth2AuthorizedClientManager, registrationId);

    // }

    // @Bean

    // McpSyncClientCustomizer syncClientCustomizer() {

    //     return (name, syncSpec) -> syncSpec.transportContextProvider(new AuthenticationMcpTransportContextProvider());

    // }

    @Bean

    McpSyncHttpClientRequestCustomizer requestCustomizer(OAuth2AuthorizedClientManager oAuth2AuthorizedClientManager,

            ClientRegistrationRepository clientRegistrationRepository) {

        var registrationId = findUniqueClientRegistration(clientRegistrationRepository);

        return new OAuth2AuthorizationCodeSyncHttpRequestCustomizer(oAuth2AuthorizedClientManager, registrationId);

    }

    @Bean

    McpSyncClientCustomizer syncClientCustomizer() {

        return (name, syncSpec) -> syncSpec.transportContextProvider(new AuthenticationMcpTransportContextProvider());

    }

    /**

     * Returns the ID of the {@code spring.security.oauth2.client.registration}, if