fix: resolve PostgreSQL migration issues for development environment

- Added DATABASE_CLIENT=pg to docker-compose.dev.yml for PostgreSQL connection
- Fixed migration 032 to check if tables exist before creating
- Removed language-specific email template columns (use standard columns)
- Added conditional checks for app_settings and email_templates inserts
- Created helper scripts for migration state management
- Added .env.dev with PostgreSQL configuration for development

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.dev.yml

@@ -13,6 +13,7 @@ services:
       - JWT_SECRET=${JWT_SECRET}
       - ADMIN_USERNAME=${ADMIN_USERNAME:-admin}
       - ADMIN_EMAIL=${ADMIN_EMAIL:-admin@example.com}
+      - DATABASE_CLIENT=pg
       - DATABASE_URL=postgresql://${DB_USER}:${DB_PASSWORD}@postgres:5432/${DB_NAME}
       - DB_TYPE=postgresql
       - DB_HOST=postgres