Improve user registration and access control for different account types
Adds admin user creation, role-based access, password confirmation, and professional profile fields to the user schema. Replit-Commit-Author: Agent Replit-Commit-Session-Id: 556aa286-edd2-4cea-8583-f4fc3cfd119b Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/81470e0d-8ae8-4335-9301-cd9a69e670fa/8e77b04a-d19f-45af-9f57-84d64672fc92.jpg
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