- Refactored `SamlIdpService` to enhance SAML NameID handling, adding support for configurable formats and sources with `SamlNameIdFormatEnum`.
- Enabled custom attribute mapping with dynamic claims resolution, supporting app-level configurations.
- Standardized SAML namespace usage across all element creation methods to ensure compliance with SAML 2.0 specifications.
- Improved cryptographic signature handling with Exclusive Canonicalization (C14N) and proper DOM node positioning.
- Added new unit tests to verify SAML responses and cryptographic signature validation.
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