Stage 4 — Labor Catalog: fixed price + default parts + service templates

Schema:
- labors.pricing_mode (hourly/fixed) + fixed_price
- labor_parts (default parts auto-added with a labor)
- service_templates + service_template_items (labor/part bundles)

ServiceComposer:
- addLabor(wo, labor, withParts) — hourly (hours×rate) or fixed (fixed_price),
  then auto-adds the labor's default parts
- addPart(wo, part, qty) — catalog price snapshot
- applyTemplate(wo, template) — adds all labor+part lines, recalcs total
- hourlyRate from settings.labor_rate

Filament:
- LaborResource: pricing_mode (live) toggles hours/fixed_price fields,
  DefaultPartsRelationManager
- ServiceTemplateResource (Service group) with ItemsRelationManager
- WorkOrder edit "Aplică șablon" action → applyTemplate
- WorksRelationManager CreateAction auto-adds labor default parts

Tests (6 new):
- hourly rate×hours; fixed uses fixed_price; default parts auto-added;
  withParts=false skips; applyTemplate adds lines + recalcs total;
  templates tenant-isolated

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

app/Filament/Tenant/Resources/WorkOrderResource/Pages/EditWorkOrder.php

@@ -15,6 +15,26 @@ class EditWorkOrder extends EditRecord
     protected function getHeaderActions(): array
     {
         return [
+            Actions\Action::make('apply_template')
+                ->label('Aplică șablon')
+                ->icon('heroicon-m-clipboard-document-list')
+                ->color('gray')
+                ->schema([
+                    \Filament\Forms\Components\Select::make('template_id')
+                        ->label('Șablon serviciu')
+                        ->options(fn () => \App\Models\Tenant\ServiceTemplate::where('is_active', true)->pluck('name', 'id'))
+                        ->searchable()
+                        ->required(),
+                ])
+                ->action(function (array $data) {
+                    $template = \App\Models\Tenant\ServiceTemplate::with('items')->find($data['template_id']);
+                    if (! $template) return;
+                    $r = app(\App\Services\ServiceComposer::class)->applyTemplate($this->record, $template);
+                    $this->fillForm();
+                    \Filament\Notifications\Notification::make()
+                        ->title("Șablon aplicat: {$r['labor']} manopere, {$r['parts']} piese")
+                        ->success()->send();
+                }),
             Actions\Action::make('ai_diagnose')
                 ->label('AI: sugerează diagnostic')
                 ->icon('heroicon-m-sparkles')