Rename VIP role to Managerial across codebase

[cmbaldwin]

Summary

This PR renames the vip user role to managerial throughout the codebase to better reflect the actual responsibilities and permissions of this role level.

Key Changes

• User Model: Updated the role enum from vip: 1 to managerial: 1 in User model and all related files
• Authorization Policies: Updated all policy files (OrderPolicy, SupplierPolicy, SupplyPolicy) to check user.managerial? instead of user.vip?
• Model Scopes: Updated authorization scopes in Order, Supplier, and Supply models to use the new role
• Controllers: Renamed check_vip methods to check_managerial in application controllers and updated role checks
• Tests: Updated all test files to use @managerial user fixture and managerial trait instead of vip
• Test Factories: Updated user factory to use :managerial trait and set default role accordingly
• Views: Updated conditional checks in ERB templates to reference managerial? instead of vip?
• Documentation: Updated README, sandbox demo, and integration documentation to reference "Managerial" role
• Demo Accounts: Updated sandbox demo account from vip@oroshi.local to managerial@oroshi.local

Implementation Details

• All functionality remains identical; this is purely a naming/terminology change
• The role maintains the same permission level (full access alongside admin, with read-only access for employees)
• All 30+ files updated consistently to ensure no references to the old vip terminology remain in active code

https://claude.ai/code/session_01DedDwrxdECCXZYKgMWLjxP