Add restaurant/café mode: floor, open tabs, and kitchen display (Phase 1)

Gated by a per-location service_style (retail | restaurant). Restaurant mode adds:
- Floor screen with tables (areas, seats, status) — tap a free table to open a
  dine-in tab; takeaway/counter orders open from the same screen.
- Open tickets (tabs): a sale stays pending while items are added; lines persist
  as you go (posTicket Alpine component posts each change to the server).
- Send-to-kitchen fires un-sent lines; a polling Kitchen Display (KDS) shows
  active tickets and bumps items queued → preparing → ready → served.
- Settlement reuses the existing cash / Ladill Pay flow; paying closes the tab
  and frees the table (PosSaleService::closeTicket, wired into both pay paths).
- Settings gains the mode toggle and a tables manager.

Schema is additive (new pos_tables; service_style on locations; order/kitchen
columns on sales + lines). Retail flow is untouched. Sidebar surfaces Floor +
Kitchen only in restaurant mode. New PosRestaurantTest covers the dine-in
lifecycle end to end; suite green (10 passed).

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

app/Models/PosSaleLine.php

@@ -7,6 +7,19 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 class PosSaleLine extends Model
 {
+    public const KITCHEN_NEW = 'new';
+
+    public const KITCHEN_QUEUED = 'queued';
+
+    public const KITCHEN_PREPARING = 'preparing';
+
+    public const KITCHEN_READY = 'ready';
+
+    public const KITCHEN_SERVED = 'served';
+
+    /** States the KDS bump button cycles through, in order. */
+    public const KITCHEN_FLOW = [self::KITCHEN_QUEUED, self::KITCHEN_PREPARING, self::KITCHEN_READY, self::KITCHEN_SERVED];
+
     protected $fillable = [
         'pos_sale_id',
         'product_id',
@@ -15,6 +28,8 @@ class PosSaleLine extends Model
         'quantity',
         'line_total_minor',
         'position',
+        'kitchen_state',
+        'notes',
     ];
 
     protected function casts(): array