feat: Complete Phase 5C and Phase 5D documentation, including performance metrics, SEO optimization, and advanced features implementation

docs: Add production deployment success documentation for Azure Static Web App

docs: Create Quick Start guide for project setup and deployment instructions

docs: Update README.md to include new documentation links and structure

docs: Enhance User Manual with detailed portal access, roles, and AI assistance features

scripts: Implement architecture diagram export script using Mermaid CLI

scripts: Create script to auto-generate documentation index for easier navigation

chore: Remove unused update-doc-index script

docs/CHANGELOG.md

@@ -0,0 +1,42 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+Follows [Semantic Versioning](https://semver.org/) and keep a reverse chronological order.
+
+## [1.0.0] - 2025-11-11
+### Added
+- Initial consolidated documentation index (`docs/README.md`).
+- QuickStart guide (`docs/QuickStart.md`).
+- User Manual (`docs/UserManual.md`).
+- Production deployment report and phase reports relocated under `docs/`.
+- Automated doc index & architecture export scripts placeholders.
+
+### Changed
+- Root `README.md` updated to reflect enterprise platform scope (portals, AI, multi-language, Azure deployment).
+
+### Removed
+- Duplicate phase/report markdown files from project root.
+
+### Notes
+This version captures the post-modernization, production deployment baseline.
+
+## Prior Milestones (Pre-versioning)
+| Date | Milestone | Summary |
+|------|-----------|---------|
+| 2025-01 | Comprehensive Modernization | Dependency updates, security hardening, build optimization |
+| 2024-10 | Phase 3B Completion | AI engine, training system, analytics, mobile volunteer app |
+| 2024-09 | Phase 3 Architecture Draft | Enterprise architecture & AI design documented |
+| 2024-08 | Performance & SEO (Phase 5C) | PWA, SEO meta, performance hooks |
+
+## Versioning Policy
+- MAJOR: Structural/architectural shifts or breaking API/portal changes.
+- MINOR: New portal capabilities, AI model integrations, additional languages.
+- PATCH: Documentation updates, small fixes, non-breaking UI adjustments.
+
+## Upcoming
+- AI Voice Assistant integration.
+- Automated architecture diagram PNG generation.
+- CI workflow to regenerate docs index on merge to `main`.
+
+---
+Last updated: 2025-11-11