Bump version to 0.5.0 for settings management release

Settings management represents a significant new feature warranting a minor version bump:
- Database-backed configuration with 102 settings
- Fernet encryption for sensitive values
- Setup wizard for first-time installations
- Complete admin UI and REST API
- OAuth admin group support

Version updated: 0.3.3 → 0.5.0

Keep 0.3.3 release notes intact (drag-and-drop feature from main branch).
Add 0.5.0 as new current release with settings features.

Updated files:
- VERSION: 0.5.0
- CHANGELOG.md: Added 0.5.0 release, kept 0.3.3 intact
- MILESTONES.md: Added v0.5.0 section, adjusted future versions
- TODO.md: Updated current version
- ROADMAP.md: Updated current status
- app/config.py: Default version 0.5.0-dev
- docs/BuildMetadata.md: Updated reference
- ANALYSIS_SUMMARY.md: Updated version

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

ROADMAP.md

@@ -7,7 +7,7 @@
 
 DocuElevate aims to be the premier open-source intelligent document processing platform, providing seamless integration with cloud storage providers, advanced AI-powered metadata extraction, and enterprise-grade security and scalability.
 
-## Current Status (v0.3.3)
+## Current Status (v0.5.0)
 
 ### Core Features ✅
 - Multi-provider document storage (Dropbox, Google Drive, OneDrive, Nextcloud, S3, etc.)