refactor(roles): role create/edit as a full page instead of a modal

Per feedback, 'New role' (and Edit) now open a dedicated page instead of a
modal:
- New RoleForm full-page component + view at /admin/roles/create and
  /admin/roles/{role}/edit (name, description, permission checkboxes; saves
  and redirects back to the list).
- RoleManager trimmed: the create/edit modal and its logic removed; 'New role'
  and the per-row/view-modal Edit are now links to the new pages.
- Kept the read-only View modal, single + bulk delete, and protections.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

routes/web.php

@@ -137,6 +137,8 @@ Route::get('/reports/dashboard', ReportsDashboard::class)->name('reports.dashboa
         Route::get('/users/{user}',       \App\Livewire\UserView::class)->name('users.show');
         Route::get('/users/{user}/edit',  \App\Livewire\UserForm::class)->name('users.edit');
         Route::get('/roles',               \App\Livewire\RoleManager::class)->name('roles');
+        Route::get('/roles/create',        \App\Livewire\RoleForm::class)->name('roles.create');
+        Route::get('/roles/{role}/edit',   \App\Livewire\RoleForm::class)->name('roles.edit');
         Route::get('/permissions',         \App\Livewire\RolePermissionManager::class)->name('permissions');
     });