Add database migration scripts and configuration files

- Add verify-migration.js script for testing database migrations
- Add database config module for centralized configuration
- Add chutes.txt prompt for system responses
- Update database implementation and testing documentation
- Add database migration and setup scripts
- Update session system and LLM tool configuration
- Update deployment checklist and environment example
- Update Dockerfile and docker-compose configuration

.env.example

@@ -65,8 +65,12 @@ SESSION_SECRET=
 USE_JSON_DATABASE=
 DATABASE_PATH=./.data/shopify_ai.db
 DATABASE_ENCRYPTION_KEY=
+DATABASE_KEY_FILE=
 DATABASE_BACKUP_ENABLED=1
 DATABASE_WAL_MODE=1
+DATABASE_USE_SQLCIPHER=1
+DATABASE_CIPHER_COMPAT=4
+DATABASE_KDF_ITER=64000
 
 # JWT Token Configuration
 JWT_SECRET=