Portal: display System Name read-only on dashboard and admin lists

Show the System Name where license keys are listed, falling back to an
'Unnamed system' indication when unset. No rename UI or mutation path.

src/routes/(protected)/(user)/dashboard/+page.svelte

@@ -44,6 +44,7 @@
 						class="border-b border-slate-200 bg-slate-50 text-xs tracking-wide text-slate-500 uppercase dark:border-slate-800 dark:bg-slate-950 dark:text-slate-400"
 					>
 						<tr>
+							<th class="px-6 py-3 font-semibold">System Name</th>
 							<th class="px-6 py-3 font-semibold">Key</th>
 							<th class="px-6 py-3 font-semibold">Status</th>
 							<th class="px-6 py-3 font-semibold">Created</th>
@@ -53,6 +54,13 @@
 					<tbody class="divide-y divide-slate-100">
 						{#each data.licenseKeys as key (key.key)}
 							<tr class="hover:bg-slate-50 dark:hover:bg-slate-800">
+								<td class="px-6 py-4 text-slate-800 dark:text-slate-200">
+									{#if key.systemName}
+										{key.systemName}
+									{:else}
+										<span class="text-slate-400 dark:text-slate-500">Unnamed system</span>
+									{/if}
+								</td>
 								<td class="px-6 py-4 font-mono text-slate-800 dark:text-slate-200">{key.key}</td>
 								<td class="px-6 py-4">
 									{#if key.active}
@@ -104,6 +112,9 @@
 									{/if}
 								</span>
 							</div>
+							<span class="text-xs text-slate-500 dark:text-slate-400">
+								{key.systemName ?? 'Unnamed system'}
+							</span>
 							<span class="text-xs text-slate-500 dark:text-slate-400"
 								>Created {formatDate(key.createdAt)}</span
 							>

src/routes/(protected)/admin/license-keys/+page.svelte

@@ -14,6 +14,7 @@
 
 	const columns: DataTableColumn[] = [
 		{ label: 'Key', value: (r) => r.key },
+		{ label: 'System Name', value: (r) => (r.systemName as string | null) ?? 'Unnamed system' },
 		{
 			label: 'User',
 			value: (r) => (r.user as Record<string, unknown> | undefined)?.name ?? ''