Fix beauty agent edge function

Dismissed unused webhook comment and simplified parsers; migrated webhook parsing to concise try/catch blocks, refined concern detection, added product-context helpers, and updated AI orchestration to use supported auth (getUser) and robust streaming responses. Removed references to non-existent fields and tables, and aligned keywords/supporting logic.

X-Lovable-Edit-ID: edt-07bfeec3-714d-413a-bcac-51334a67c191

Author: lovable-dev[bot]