Add a User Roles system where roles define reusable permission templates.
When a user has a role assigned, the role provides fallback permissions
(user's direct permissions take precedence; role is used when user has 'None').
Database changes:
- Add User_Roles table with same permission fields as Users
- Add Role_Groups_Permissions table for per-role group overrides
- Add Role_Monitors_Permissions table for per-role monitor overrides
- Add RoleId foreign key to Users table
Permission resolution order:
1. User's direct Monitor/Group permissions (if not 'Inherit')
2. Role's Monitor/Group permissions (if user has role)
3. Role's base permission (if user's is 'None')
4. User's base permission (fallback)
Includes:
- PHP models: User_Role, Role_Group_Permission, Role_Monitor_Permission
- Role management UI in Options > Roles tab
- Role selector in user edit form
- REST API endpoints for roles CRUD
- Translation strings for en_gb
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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