Stage 5.1 — Warehouse ERP: batches + FIFO + reservations + multi-warehouse

Schema:
- warehouses (multi-warehouse, code unique per company, is_default)
- part_batches (lot per receipt, qty_in/qty_remaining, buy_price, FIFO-indexed)
- warehouse_events (immutable ledger: opening/receipt/issue/transfer/adjustment/write_off)
- part_reservations (per-WO allocations from specific batches, active/consumed/released)
- companies.default_warehouse_id + parts.qty_reserved

Backfill: 1 default warehouse + 1 opening batch per existing part per company.

WarehouseService:
- receive / issue (FIFO) / reserve / release / consume / transfer / adjust
- DB::transaction + lockForUpdate on batch rows
- InsufficientStockException with requested + available context
- Auto-syncs parts.qty as aggregate cache (source of truth = sum(qty_remaining))

WO integration:
- WorkOrderPart created/updated → reserve from FIFO batches
- WorkOrderPart deleted → release
- WorkOrder status=done → consume reservations into issue events
- WorkOrder status=cancelled → release reservations

Filament:
- WarehouseResource (CRUD)
- BatchesRelationManager on PartResource (FIFO list with qty_remaining + cost)
- "Recepție" action on parts list → calls WarehouseService::receive
- qty_reserved column added on parts list

Tests (8 new, all pass):
- receipt creates batch + event
- FIFO order verified across 3 batches with different received_at
- InsufficientStockException on over-issue
- Reservations block other reservations but don't deplete on-hand
- WO done consumes; WO cancelled releases
- Batches tenant-isolated
- Transfer between warehouses with weighted-avg cost

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Models/Tenant/WorkOrder.php

@@ -141,6 +141,20 @@ class WorkOrder extends Model implements HasMedia
                 app(\App\Services\NotificationDispatcher::class)->workOrderReady($wo);
             }
 
+            // Warehouse lifecycle: status=done → consume reservations into issues;
+            // status=cancelled → release reservations.
+            if ($wo->wasChanged('status')) {
+                $svc = app(\App\Services\Warehouse\WarehouseService::class);
+                if ($wo->status === 'done' && $wo->getOriginal('status') !== 'done') {
+                    $svc->consume($wo);
+                }
+                if ($wo->status === 'cancelled' && $wo->getOriginal('status') !== 'cancelled') {
+                    foreach ($wo->parts as $wop) {
+                        $svc->release($wop);
+                    }
+                }
+            }
+
             // Broadcast real-time update on any field change (skip if broadcasting=log).
             if (config('broadcasting.default') !== 'log') {
                 try {