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>

docs/BuildMetadata.md

@@ -73,7 +73,7 @@ The `app/config.py` Settings class provides these properties for accessing build
 Returns the application version with the following priority:
 1. `APP_VERSION` environment variable
 2. Contents of `VERSION` file
-3. Default: `"0.3.3-dev"`
+3. Default: `"0.5.0-dev"`
 
 ### `settings.build_date` (property)
 Returns the build date with the following priority: