Sanitize codebase, reorganize docs, and add missing deploy files

Remove dead code identified in docs/SANITIZATION-REVIEW.md:
- app/blueprints/content_old.py and app/blueprints/playlist.py
- app/models/group.py, app/utils/nginx_config_reader.py
- orphaned templates (content_list, edit_content, upload_content,
  player_page) and the related group/Template references

Result: 6 blueprints, 82 routes, no dead modules or orphan templates.

Add files that deploy.sh and docker-entrypoint.sh already require but
which were never tracked:
- https_manager.py       (referenced by deploy.sh, migrate_network.sh,
                          docker-entrypoint.sh)
- Caddyfile.example      (seeded by deploy.sh; its absence aborts deploy)

Relocate generated Graphify artifacts from graphify-out/ to
docs/graphify-out/ (110 files, no content change) and archive the
superseded docs under docs/.

Ignore hygiene:
- ignore ad-hoc .env backups (.env.bak*) — they contain live secrets
- keep the pre-sanitization snapshots (docs/legacy code/,
  docs/old_code_documentation/) on disk but out of the repo

Fix .env.example: drop a duplicated config block, genericize the
hardcoded host IP, and document HOSTNAME_INTERNAL.

app/blueprints/players.py

@@ -585,14 +585,6 @@ def get_player_playlist(player_id: int) -> List[dict]:
     return playlist
 
 
-@players_bp.route('/<int:player_id>/reorder', methods=['POST'])
-@login_required
-def reorder_content(player_id: int):
-    """Legacy endpoint - Content reordering now handled in playlist management."""
-    return jsonify({
-        'success': False, 
-        'error': 'Content reordering is now managed through playlists. Use the Playlists page to reorder content.'
-    }), 400
 
 
 @players_bp.route('/bulk/delete', methods=['POST'])
@@ -686,97 +678,3 @@ def deployment_status():
     except Exception as e:
         log_action('error', f'Error fetching deployment status: {str(e)}')
         return jsonify({'error': str(e)}), 500
-
-
-@players_bp.route('/<int:player_id>/playlist/reorder', methods=['POST'])
-@login_required
-def reorder_playlist(player_id: int):
-    """Reorder items in player's playlist."""
-    try:
-        data = request.get_json()
-        content_id = data.get('content_id')
-        direction = data.get('direction')  # 'up' or 'down'
-        
-        if not content_id or not direction:
-            return jsonify({'success': False, 'message': 'Missing parameters'}), 400
-        
-        # Get the content item
-        content = Content.query.filter_by(id=content_id, player_id=player_id).first()
-        if not content:
-            return jsonify({'success': False, 'message': 'Content not found'}), 404
-        
-        # Get all content for this player, ordered by position
-        all_content = Content.query.filter_by(player_id=player_id)\
-            .order_by(Content.position, Content.uploaded_at).all()
-        
-        # Find current index
-        current_index = None
-        for idx, item in enumerate(all_content):
-            if item.id == content_id:
-                current_index = idx
-                break
-        
-        if current_index is None:
-            return jsonify({'success': False, 'message': 'Content not in playlist'}), 404
-        
-        # Swap positions
-        if direction == 'up' and current_index > 0:
-            # Swap with previous item
-            all_content[current_index].position, all_content[current_index - 1].position = \
-                all_content[current_index - 1].position, all_content[current_index].position
-        elif direction == 'down' and current_index < len(all_content) - 1:
-            # Swap with next item
-            all_content[current_index].position, all_content[current_index + 1].position = \
-                all_content[current_index + 1].position, all_content[current_index].position
-        
-        db.session.commit()
-        cache.delete_memoized(get_player_playlist, player_id)
-        
-        log_action('info', f'Reordered playlist for player {player_id}')
-        return jsonify({'success': True})
-        
-    except Exception as e:
-        db.session.rollback()
-        log_action('error', f'Error reordering playlist: {str(e)}')
-        return jsonify({'success': False, 'message': str(e)}), 500
-
-
-@players_bp.route('/<int:player_id>/playlist/remove', methods=['POST'])
-@login_required
-def remove_from_playlist(player_id: int):
-    """Remove content from player's playlist."""
-    try:
-        data = request.get_json()
-        content_id = data.get('content_id')
-        
-        if not content_id:
-            return jsonify({'success': False, 'message': 'Missing content_id'}), 400
-        
-        # Get the content item
-        content = Content.query.filter_by(id=content_id, player_id=player_id).first()
-        if not content:
-            return jsonify({'success': False, 'message': 'Content not found'}), 404
-        
-        filename = content.filename
-        
-        # Delete from database
-        db.session.delete(content)
-        
-        # Increment playlist version
-        player = Player.query.get(player_id)
-        if player:
-            player.playlist_version += 1
-        
-        db.session.commit()
-        
-        # Clear cache
-        cache.delete_memoized(get_player_playlist, player_id)
-        
-        log_action('info', f'Removed "{filename}" from player {player_id} playlist (version {player.playlist_version})')
-        return jsonify({'success': True, 'message': f'Removed "{filename}" from playlist'})
-        
-    except Exception as e:
-        db.session.rollback()
-        log_action('error', f'Error removing from playlist: {str(e)}')
-        return jsonify({'success': False, 'message': str(e)}), 500
-