Feat/issues 144 145 docgen saml

[DevMusa001]

PR summary:

• Implement Automated Documentation Generation #144 Automated documentation generation - backend/src/doc_generator.rs parses module sources for public items, extracts signatures, parameter types and return types, lifts examples from #[test]/#[tokio::test] bodies, and renders reference markdown; process documented in docs/documentation-generation.md.
• Implement SAML 2.0 Support for Enterprise SSO #145 SAML 2.0 enterprise SSO - backend/src/saml.rs adds an SP with metadata and AuthnRequest endpoints, an ACS endpoint for the HTTP POST binding, assertion validation (status, issuer, audience, validity window with clock skew, pinned signer, InResponseTo, replay), and configurable attribute mapping; setup documented in docs/saml-sso.md.

Closes

Closes #144
Closes #145

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