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>

.env.dev

@@ -0,0 +1,39 @@
+# Development Environment with PostgreSQL
+# Copy this to .env for PostgreSQL development with Docker Compose
+
+# JWT Secret (development only)
+JWT_SECRET=dev-secret-key-do-not-use-in-production
+
+# Database Configuration (PostgreSQL)
+DATABASE_CLIENT=pg
+DB_USER=picpeak_dev
+DB_PASSWORD=dev_password_123
+DB_NAME=picpeak_dev
+
+# Redis Configuration
+REDIS_PASSWORD=dev_redis_pass
+
+# Admin Account (initial setup)
+ADMIN_USERNAME=admin
+ADMIN_EMAIL=admin@localhost
+
+# Email Configuration (Mailhog for development)
+SMTP_HOST=mailhog
+SMTP_PORT=1025
+SMTP_SECURE=false
+SMTP_USER=
+SMTP_PASS=
+EMAIL_FROM=noreply@picpeak.local
+
+# Application URLs
+FRONTEND_URL=http://localhost:3000
+ADMIN_URL=http://localhost:3001
+VITE_API_URL=http://localhost:3001/api
+
+# Timezone
+TZ=UTC
+
+# Analytics (Optional - leave empty for development)
+VITE_UMAMI_URL=
+VITE_UMAMI_WEBSITE_ID=
+VITE_UMAMI_SHARE_URL=