Merge wilm: gevent migration, endpoint telemetry phase 2, backup/restore

Brings in 98 commits from wilm (origin/wilm @ 811e6ca61a):

Major features:
- Move API to gevent workers for better concurrency
- Endpoint agent startup jitter (prevents thundering herd)
- Complete backup/restore with restic
- Endpoint telemetry phase 2 (disk health, mapped drives, user context)
- PC Detail UI rework with new cards and tabs
- Dell Command actions and Corporate Tools tab
- Agent version column in Fleet view

Conflict resolution:
- Backup/restore: Accepted wilm implementation (10 files)
- Agent startup jitter: Accepted wilm v1.12.0
- PC Types list fix: Accepted wilm version
- Endpoint plugin domain clamping: Kept ours (defensive)
- Test files: Accepted wilm versions for consistency

Testing required:
- Verify gevent handles concurrent requests
- Test backup/restore functionality
- Verify agent startup jitter timing
- Test endpoint telemetry collection
- Validate PC Detail UI changes

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

frontend/src/views/settings/ShopdbBackupsList.vue

@@ -4,18 +4,9 @@
       <h2>Backups</h2>
     </div>
 
-    <div v-if="!isConfigured" class="not-configured">
-      <strong>Site Backups is not configured on this deployment.</strong>
-      <span>
-        The feature needs the backup overlay (a separate container writing sets
-        onto a shared volume) and a readable backups root. A Windows/IIS install
-        does not run it, so nothing here would have a store behind it.
-      </span>
-    </div>
-
     <!-- Confidence banner: the single most reassuring thing an admin wants to
          see - is there a recent, verified backup? Everything else is secondary. -->
-    <div v-if="isConfigured" class="confidence-banner" :class="bannerClass">
+    <div class="confidence-banner" :class="bannerClass">
       <span class="banner-icon">
         <component :is="bannerIcon" :size="22" />
       </span>
@@ -311,9 +302,6 @@ const sets = ref([])
 const loading = ref(true)
 const isBusy = ref(false)
 const lastGoodAt = ref(null)
-// Assume configured until the list says otherwise, so a slow first load
-// does not flash the not-configured notice on a working install.
-const isConfigured = ref(true)
 const restoreTarget = ref(null)
 
 // Live restore progress. restoreStatus mirrors the api /status.restore payload;
@@ -417,10 +405,6 @@ async function load() {
     const response = await api.get('/shopdbbackups')
     sets.value = response.data.data || []
     lastGoodAt.value = response.data.meta?.lastgoodat || null
-    // A deployment without the backup overlay has no store behind any of
-    // this. Say so instead of showing 'No verified backup yet', which reads
-    // as a backup that failed rather than a feature that is not installed.
-    isConfigured.value = response.data.meta?.configured !== false
   } catch (error) {
     toast.error('Could not load backups.')
   } finally {
@@ -663,17 +647,6 @@ onUnmounted(() => {
 .banner-none { border-color: #c53030; }
 .banner-none .banner-icon { color: #e53e3e; }
 
-.not-configured {
-  display: flex;
-  flex-direction: column;
-  gap: 0.35rem;
-  padding: 1rem 1.25rem;
-  margin-bottom: 1rem;
-  border: 1px solid var(--border-color, #d8dbe0);
-  border-radius: 8px;
-  background: var(--surface-muted, #f6f7f9);
-}
-
 .explain {
   margin-bottom: 1.25rem;
   border: 1px solid var(--border);