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/init-data.sh.deprecated

@@ -0,0 +1,29 @@
+#!/bin/bash
+# Initialize ./data folder with all necessary files for deployment
+
+set -e
+
+echo "🔧 Initializing data folder..."
+mkdir -p data/{app,instance,uploads}
+
+echo "📁 Copying app folder..."
+rm -rf data/app
+mkdir -p data/app
+cp -r app/* data/app/
+
+echo "📋 Copying migrations..."
+rm -rf data/migrations
+cp -r migrations data/
+
+echo "🔧 Copying utility scripts..."
+cp fix_player_user_schema.py data/
+
+echo "🔐 Setting permissions..."
+chmod 755 data/{app,instance,uploads}
+chmod -R 755 data/app/
+find data/app -type f \( -name "*.py" -o -name "*.html" -o -name "*.css" -o -name "*.js" \) -exec chmod 644 {} \;
+chmod 777 data/instance data/uploads
+
+echo "✅ Data folder initialized successfully!"
+echo "📊 Data folder contents:"
+du -sh data/*/