chore: consolidate all persistent data into ./data folder

- Update docker-compose.yml to mount Caddyfile from ./data
- Remove Dockerfile directory creation - handled by init-data.sh
- Add init-data.sh script to initialize ./data with all required files
- Add DATA_DEPLOYMENT.md documentation for deployment workflow
- Update .gitignore to exclude ./data folder
- All persistent data (app, config, database, uploads) now centralized in ./data

init-data.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+# Initialize ./data folder with all necessary files for deployment
+
+set -e
+
+echo "🔧 Initializing data folder..."
+mkdir -p data/{app,instance,uploads,caddy-data,caddy-config}
+
+echo "📁 Copying app folder..."
+rm -rf data/app
+cp -r app data/
+
+echo "📋 Copying Caddyfile..."
+cp Caddyfile data/
+
+echo "🔐 Setting permissions..."
+chmod 755 data/{app,instance,uploads,caddy-data,caddy-config}
+chmod 644 data/Caddyfile
+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/*/