Backend (IAM Service):
- New GetRolePermissionsQuery + Handler: reads permissions from role_claims
- New UpdateRolePermissionsCommand + Handler: validates permission names
against StaffPermissions enum, replaces role_claims, blocks system roles
- New endpoints: GET/PUT /api/v1/roles/{id}/permissions
- GetRolesQuery: batch-fetch permissions per role via role_claims join
- RoleResponse: add Permissions field to API response
- Seeded role_claims for Admin (7), Merchant (7), MerchantAdmin (6),
MerchantStaff (2), SuperAdmin (All), Support (2)
Frontend (Blazor WASM):
- IamApiService: add Permissions to RoleDto, UpdateRolePermissionsAsync()
- RolePermissions.razor: replace hardcoded GetPermissionsForRole() with
API-driven permission toggles from role_claims data
- Editable toggles for non-system roles, disabled for system roles
- Save/Cancel buttons appear when permissions modified
- 7 permission types matching StaffPermissions enum
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
