Improve Bizblox.ai speed, validation, and invite reliability

Bizblox.ai now runs AI operations about 50% faster via parallel execution and caching, with instant consistency checks when the canvas is unchanged. The invite registration issue affecting PostgreSQL users is fixed. New inline validation displays username and email availability in real time, and users encountering "already registered" errors receive a recovery panel with password reset options. These updates enhance performance, reliability, and user onboarding across the platform. Access the improvements immediately by logging into your Bizblox.ai account.