Final: Complete modernization - Option 1 deployment, unified persistence, migration scripts

- Implement Docker image-based deployment (Option 1)
  * Code immutable in image, no volume override
  * Eliminated init-data.sh manual step
  * Simplified deployment process

- Unified persistence in data/ folder
  * Moved nginx.conf and nginx-custom-domains.conf to data/
  * All runtime configs and data in single location
  * Clear separation: repo (source) vs data/ (runtime)

- Archive legacy features
  * Groups blueprint and templates removed
  * Legacy playlist routes redirected to content area
  * Organized in old_code_documentation/

- Added network migration support
  * New migrate_network.sh script for IP changes
  * Regenerates SSL certs for new IP
  * Updates database configuration
  * Tested workflow: clone → deploy → migrate

- Enhanced deploy.sh
  * Creates data directories
  * Copies nginx configs from repo to data/
  * Validates file existence before deployment
  * Prevents incomplete deployments

- Updated documentation
  * QUICK_DEPLOYMENT.md shows 4-step workflow
  * Complete deployment workflow documented
  * Migration procedures included

- Production ready deployment workflow:
  1. Clone & setup (.env configuration)
  2. Deploy (./deploy.sh)
  3. Migrate network (./migrate_network.sh if needed)
  4. Normal operations (docker compose restart)

old_code_documentation/LEGACY_PLAYLIST_ROUTES.md

@@ -0,0 +1,51 @@
+# Legacy Playlist Routes & Templates
+
+## Status: DEPRECATED ❌
+
+The `playlist/` folder contains legacy code that has been superseded by the content management interface.
+
+## What Changed
+
+### Old Workflow (DEPRECATED)
+- Route: `/playlist/<player_id>` 
+- Template: `playlist/manage_playlist.html`
+- Used for managing playlists at the player level
+
+### New Workflow (ACTIVE) ✅
+- Route: `/content/playlist/<playlist_id>/manage`
+- Template: `content/manage_playlist_content.html`
+- Used for managing playlists in the content area
+- Accessed from: Players → Manage Player → "Edit Playlist Content" button
+
+## Migration Notes
+
+**January 17, 2026:**
+- Moved `app/templates/playlist/` to `old_code_documentation/playlist/`
+- Updated `/playlist/<player_id>` route to redirect to the new content management interface
+- All playlist operations now go through the content management area (`manage_playlist_content.html`)
+
+## Why the Change?
+
+1. **Unified Interface**: Single playlist management interface instead of duplicate functionality
+2. **Better UX**: Content management area is the primary interface accessed from players
+3. **Maintenance**: Reduces code duplication and maintenance burden
+
+## Routes Still in Code
+
+The routes in `app/blueprints/playlist.py` still exist but are now legacy:
+- `@playlist_bp.route('/<int:player_id>')` - Redirects to content management
+- `@playlist_bp.route('/<int:player_id>/add')` - No longer used
+- `@playlist_bp.route('/<int:player_id>/remove/<int:content_id>')` - No longer used
+- etc.
+
+These can be removed in a future cleanup if needed.
+
+## Features in New Interface
+
+The new `manage_playlist_content.html` includes all features plus:
+- ✅ Drag-to-reorder functionality
+- ✅ Duration spinner buttons (⬆️ ⬇️)
+- ✅ Audio on/off toggle
+- ✅ Edit mode toggle for PDFs/images
+- ✅ Dark mode support
+- ✅ Bulk delete with checkboxes