Support Custom Dashboard Roles with Granular Permissions

Introduce support for custom dashboard roles with granular, per-section permission controls. Currently, the dashboard provides only four predefined roles (Owner, Admin, Moderator, and Developer), with fixed permission sets that cannot be customized. This prevents administrators from restricting access to specific dashboard sections, such as allowing access to Integrations while restricting Credentials, or limiting Chat & Call Logs to Admins only. Providing configurable role-based access control (RBAC) with fine-grained permissions for individual dashboard modules (e.g., Logs, Credentials, Webhooks, Features, Integrations, Billing, Settings, etc.) would enable organizations to implement the principle of least privilege, improve security, and better align dashboard access with internal team responsibilities and compliance requirements.