fix: resolve backend startup errors in development

- Added STORAGE_PATH environment variable and volume mount for storage directory
- Fixed authSecurity functions to check if login_attempts table exists before using it
- Prevents errors when running with only core migrations (new deployments)

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

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

docker-compose.dev.yml

@@ -30,6 +30,7 @@ services:
       - FRONTEND_URL=${FRONTEND_URL:-http://localhost:3000}
       - ADMIN_URL=${ADMIN_URL:-http://localhost:3001}
       - TZ=${TZ:-UTC}
+      - STORAGE_PATH=/app/storage
     volumes:
       - ./events:/app/events
       - ./data:/app/data