feat(kds): filter the kitchen display by station (kitchen / bar)

Complements the separate kitchen/bar printers with an on-screen split. The live
order DTO now carries each item's prep station (MenuItem → Category →
KitchenStation), and the KDS shows station tabs (All / Kitchen / Bar / …) that
appear only once ≥2 stations are in play. Selecting a station shows just the
tickets — and just the items within each ticket — for that station, so bar staff
see drinks and kitchen staff see food. Single-station cafés see the board
unchanged. fa/en/ar strings added.

Note: order status is still per-order (one advance button); the split is for
viewing/printing, not per-item status.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Meezi.API/Services/OrderService.cs

@@ -172,6 +172,8 @@ public class OrderService : IOrderService
         var orders = await _db.Orders
             .Include(o => o.Items)
             .ThenInclude(i => i.MenuItem)
+            .ThenInclude(m => m.Category)
+            .ThenInclude(c => c.KitchenStation)
             .Include(o => o.Table)
             .Where(o => o.CafeId == cafeId && LiveStatuses.Contains(o.Status))
             .OrderBy(o => o.CreatedAt)
@@ -1345,6 +1347,8 @@ public class OrderService : IOrderService
             i.UnitPrice,
             i.Notes,
             i.IsVoided,
-            i.VoidedAt)).ToList(),
+            i.VoidedAt,
+            i.MenuItem?.Category?.KitchenStationId,
+            i.MenuItem?.Category?.KitchenStation?.Name)).ToList(),
         o.Source);
 }