Preserve deleted server history

Retain historical server identities, results, and evidence after deletion. Mark archived entries as Deleted and prevent old work from targeting servers that reuse the same name.

Fixes #16.

src/routes/campaigns/+page.svelte

@@ -6,6 +6,7 @@
     import { pollVisible } from '$ui/poll.js';
     import { confirmAction } from '$ui/confirm.js';
     import { serverTitle } from '$ui/server-labels.js';
+    import HistoricalServerIdentity from '$ui/components/HistoricalServerIdentity.svelte';
     import StatusBadge from '$ui/components/primitives/StatusBadge.svelte';
     import ListFooter from '$ui/components/primitives/ListFooter.svelte';
     import Badge from '$ui/components/primitives/Badge.svelte';
@@ -15,6 +16,7 @@
 
     interface ServerRow {
         server: string;
+        server_deleted_at?: string | null;
         restart_state: string;
         files_changed: number;
         players: number | null;
@@ -76,7 +78,7 @@
     onMount(() => pollVisible(loadCampaigns, 5000));
 
     function isActive(d: Deployment): boolean {
-        return d.servers.some((s) => s.restart_state === 'pending' || s.restart_state === 'failed');
+        return d.servers.some((s) => !s.server_deleted_at && (s.restart_state === 'pending' || s.restart_state === 'failed'));
     }
     function ago(iso: string): string {
         const d = Date.now() - new Date(iso).getTime();
@@ -108,7 +110,7 @@
         ev.preventDefault();
         ev.stopPropagation();
         const summary = scriptSummary(d) || 'this promote';
-        if (!await confirmAction({ title:'Roll back promotion?', message:`Restore the previous version of ${summary} on ${d.servers.length} servers.`, confirmLabel:'Roll back', danger:true })) return;
+        if (!await confirmAction({ title:'Roll back promotion?', message:`Restore the previous version of ${summary} on ${d.servers.filter(server => !server.server_deleted_at).length} servers.`, confirmLabel:'Roll back', danger:true })) return;
         rollingBack = d.id;
         flash = null; flashId = d.id; flashError = false;
         try {
@@ -211,7 +213,7 @@
                 {/if}
             </div>
             <div class="row-head-r">
-                {#if d.action === 'promote' && !d.rolled_back_by}
+                {#if d.action === 'promote' && !d.rolled_back_by && d.servers.some(server => !server.server_deleted_at)}
                     <Button
                         variant="danger"
                         size="sm"
@@ -233,7 +235,7 @@
                     title="{s.server}: {s.restart_state}{s.error ? ' — ' + s.error : ''}"
                 >
                     <span class="dot"></span>
-                    <a class="node-label" href="/servers/{encodeURIComponent(s.server)}?tab=diagnostics">{serverTitle(s.server)}{s.players !== null && s.players > 0 ? ` (${s.players} players at last check)` : ''}</a><StatusBadge state={s.restart_state} />
+                    <span class="node-label"><HistoricalServerIdentity name={s.server} deletedAt={s.server_deleted_at} href={`/servers/${encodeURIComponent(s.server)}?tab=diagnostics`} />{s.players !== null && s.players > 0 ? ` (${s.players} players at last check)` : ''}</span><StatusBadge state={s.restart_state} />
                 </span>
             {/each}
         </div>