feat(saml2-backend): implement SAML 2.0 identity federation SSO backend subsystem (#968)

[dipanshubatra]

Description

Introduces the SAML 2.0 Enterprise Identity Federation & SSO Java Backend Subsystem, enabling OASIS SAML 2.0 AuthnRequest generation, X.509 XML signature verification, NameID resolution, Assertion Consumer Service (ACS) attribute mapping, and Single Logout (SLO).

Key Features

• 500+ lines of Spring Boot Java backend implementation across 6 files
• Saml2IdentityFederationService.java: Service layer handling AuthnRequest building, ACS response consumption, X.509 cert validation, and Single Logout (SLO)
• Saml2IdentityFederationController.java: REST controller exposing SP metadata XML, SSO login redirect, ACS consumer, and SLO endpoints
• Saml2IdentityProviderRecord.java: JPA Entity tracking IdP metadata URLs, X.509 certificates, and NameID formats
• Saml2IdentityProviderRecordRepository.java: Spring Data JPA repository

Fixes #968
#Closed #968

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📥 Commits

Reviewing files that changed from the base of the PR and between b18cc4d and c2f0c04.

📒 Files selected for processing (6)

• Backend/src/main/java/com/medtrack/auth/saml2/controller/Saml2IdentityFederationController.java
• Backend/src/main/java/com/medtrack/auth/saml2/dto/Saml2AcsConsumeRequest.java
• Backend/src/main/java/com/medtrack/auth/saml2/dto/Saml2IdpRegistrationRequest.java
• Backend/src/main/java/com/medtrack/auth/saml2/model/Saml2IdentityProviderRecord.java
• Backend/src/main/java/com/medtrack/auth/saml2/repository/Saml2IdentityProviderRecordRepository.java
• Backend/src/main/java/com/medtrack/auth/saml2/service/Saml2IdentityFederationService.java

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