Analyze Azure AD B2C usage and create migration plan for Microsoft Entra External ID

[Copilot]

This PR provides a comprehensive analysis of the current Azure AD B2C implementation in NRZMyk and develops a detailed migration plan for transitioning to Microsoft Entra External ID, as required due to Microsoft's end-of-sale announcement.

Analysis Summary

Current Implementation:

• Blazor Server application with WebAssembly client using Azure AD B2C authentication
• Server-side: Microsoft.Identity.Web (v3.6.0) with JWT Bearer authentication + Microsoft Graph API for role management
• Client-side: Microsoft.Authentication.WebAssembly.Msal (v8.0.12) for MSAL authentication
• Custom role-based authorization using B2C extension attributes
• B2C tenant: nrcmycosis.b2clogin.com with custom user flows

Key Findings:

• ✅ Migration is technically feasible - core authentication libraries are compatible with Entra External ID
• ⚠️ Medium complexity migration requiring configuration updates and custom attribute schema migration
• 🔴 Security vulnerability identified: Microsoft.Identity.Web 3.6.0 has known moderate severity issue
• ⏰ Critical timeline: Must complete migration before March 15, 2026 (B2C P2 tenant retirement)

Documentation Created

1. Comprehensive Migration Analysis (Documents/Azure-AD-B2C-to-Entra-External-ID-Migration-Analysis.md)

   • Detailed technical analysis of current implementation
   • Risk assessment with mitigation strategies
   • Library compatibility evaluation
   • Cost considerations and timeline recommendations

2. Detailed Migration Plan (Documents/Migration-Plan-Azure-AD-B2C-to-Entra-External-ID.md)

   • 10-week phased migration approach
   • Step-by-step tasks with assignees and deliverables
   • Testing strategies and rollback procedures
   • Success criteria and monitoring plans

3. Executive Summary (Documents/Migration-Summary.md)

   • High-level overview for stakeholders
   • Immediate action items
   • Risk summary and recommendations

Migration Plan Overview

Phase 1-2 (5 weeks): Preparation and code migration
Phase 3-4 (3 weeks): Testing and staging validation
Phase 5-6 (2 weeks): Production migration and post-migration support

Recommended Timeline: Complete by Q4 2025 to allow adequate buffer time before the March 2026 deadline.

Immediate Actions Required

1. Security Update: Upgrade Microsoft.Identity.Web to address known vulnerability
2. Environment Setup: Create Entra External ID development tenant for testing
3. Team Planning: Assign migration project team and review detailed plan

The analysis shows that while the migration requires careful planning and execution, the current architecture using standard Microsoft Identity libraries facilitates a smooth transition to Entra External ID.

Fixes #185.

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