fix(events): server-side search/pagination to remove first-100 cap (#346)

Counters and search on Admin → Events were bounded to the first 100 rows
returned from /admin/events?page=1&limit=100, so on instances with more
events the totals were wrong and search couldn't find anything outside
that window. The dashboard's expiring list had the same first-100 issue.

Backend
- adminEvents.js: extend search to include customer_email so the column
  shown in the table is actually queryable.
- adminDashboard.js: add totalEvents to /dashboard/stats so the events
  page can render an accurate "All (N)" / Total Events counter without
  walking the full table on the client.

Frontend
- events.service.ts: getEvents() now accepts search + the full status
  enum (active|inactive|archived|draft|expiring); response type matches
  the actual {events, pagination} shape.
- admin.service.ts: DashboardStats gains totalEvents.
- EventsListPage.tsx: rewired around server-side pagination, status
  filter, and 300ms-debounced search; Prev/Next + range/page indicator
  below the table; placeholderData keeps the previous page visible
  during fetches; stat cards and "All (N)" pull from /dashboard/stats so
  totals stay accurate regardless of the visible page; archive/delete
  invalidates dashboard-stats so cards refresh.
- AdminDashboard.tsx: expiring list now fetches getEvents(1, 5,
  'expiring') directly instead of slicing the first 100 client-side. As
  a side effect the dashboard's "expiring" definition now matches the
  backend (was excluding events expiring within the next 24h).

backend/src/routes/adminDashboard.js

@@ -62,6 +62,13 @@ router.get('/stats', adminAuth, requirePermission('analytics.view'), async (req,
       .count('id as count')
       .first();
 
+    // Get total events count (all events regardless of status) — used by the
+    // events list page to render accurate "All (N)" / Total Events counters
+    // when the table is server-paginated (#346).
+    const totalEvents = await db('events')
+      .count('id as count')
+      .first();
+
     // Calculate trends (compare with previous 30 days)
     const sixtyDaysAgo = new Date();
     sixtyDaysAgo.setDate(sixtyDaysAgo.getDate() - 60);
@@ -98,7 +105,8 @@ router.get('/stats', adminAuth, requirePermission('analytics.view'), async (req,
       totalDownloads: totalDownloads.count || 0,
       viewsTrend: Math.round(viewsTrend * 10) / 10,
       downloadsTrend: Math.round(downloadsTrend * 10) / 10,
-      archivedEvents: archivedEvents.count || 0
+      archivedEvents: archivedEvents.count || 0,
+      totalEvents: totalEvents.count || 0
     });
   } catch (error) {
     console.error('Dashboard stats error:', error);

backend/src/routes/adminEvents.js

@@ -739,6 +739,7 @@ router.get('/', adminAuth, requirePermission('events.view'), async (req, res) =>
       query = query.where((builder) => {
         builder.where('event_name', 'like', `%${escapedSearch}%`)
           .orWhere('admin_email', 'like', `%${escapedSearch}%`)
+          .orWhere('customer_email', 'like', `%${escapedSearch}%`)
           .orWhere('slug', 'like', `%${escapedSearch}%`);
       });
     }