Stage 9 — Subcontractor System: outsourced work with cost+markup

Schema:
- subcontractors (specialty, rating, contact)
- subcontract_jobs (work_order link, cost, markup_pct, client_price, status
  workflow, sent_at/eta/returned_at, paid_to_sub)

Models:
- SubcontractJob: auto number (SC-YY-NNNN), client_price = cost×(1+markup/100)
  when markup>0 (else manual), margin() helper, recalcs parent WO on save/delete
- WorkOrder.recalcTotal now includes non-cancelled subcontract job client_price

Filament (new "Subcontractare" nav group):
- SubcontractorResource (specialty/rating CRUD)
- SubcontractJobResource board with cost/client/margin columns + status filters,
  nav badge = open jobs
- SubcontractJobsRelationManager on WorkOrder

Tests (7 new):
- client_price from markup; manual price without markup; auto number;
  WO total includes jobs; cancelled excluded; delete recalcs; tenant isolation

Closes roadmap to 16/18 stages (only Stage 10 Bodyshop remains).

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

app/Models/Tenant/WorkOrder.php

@@ -93,6 +93,11 @@ class WorkOrder extends Model implements HasMedia
         return $this->hasMany(Payment::class);
     }
 
+    public function subcontractJobs(): HasMany
+    {
+        return $this->hasMany(SubcontractJob::class);
+    }
+
     public function paidAmount(): float
     {
         return (float) $this->payments()->sum('amount');
@@ -107,7 +112,10 @@ class WorkOrder extends Model implements HasMedia
     {
         $worksTotal = $this->works()->sum('total');
         $partsTotal = $this->parts()->sum('total');
-        $sub = (float) $worksTotal + (float) $partsTotal;
+        $subcontractTotal = $this->subcontractJobs()
+            ->where('status', '!=', 'cancelled')
+            ->sum('client_price');
+        $sub = (float) $worksTotal + (float) $partsTotal + (float) $subcontractTotal;
         $disc = (float) $this->discount_pct;
         $this->total = round($sub * (1 - $disc / 100), 2);
         $this->save();