Remove Operations overview and its polling endpoint

src/routes/maintenance/+page.svelte

@@ -131,7 +131,7 @@
     {#if error}<p class="ui-error" role="alert">{error} {data ? 'Showing the last successful refresh.' : ''} <Button size="sm" onclick={load} disabled={busy}>Retry refresh</Button></p>{/if}
     {#if notice}<p role="status">{notice}</p>{/if}
     {#if data?.policies.paused}<div class="paused"><strong>All maintenance is paused.</strong> Checks and verification continue. New actions, scheduled runs, and queued maintenance are held. Submitted operations finish recovery. Campaigns, betas, and manual Provisioning actions continue.</div>{/if}
-    {#if $page.url.searchParams.has('returnTo')}<BackLink fallback="/operations" />{/if}
+    {#if $page.url.searchParams.has('returnTo')}<BackLink fallback="/provisioning" />{/if}
     <Tabs {tabs} bind:value={view} onchange={() => saveContext()} ariaLabel="Maintenance views" idPrefix="maintenance-tabs" panelId="maintenance-panel" />
     <div id="maintenance-panel" role="tabpanel" aria-labelledby={`maintenance-tabs-${view}`} class="panels">
     {#if data}