Fix total readOnly, label pay_status/discount, add RU/EN translations

- pay_status: add label Statut plată (was showing English auto-label)
- discount_pct: rename label to Reducere % (standard RO terminology)
- total: disabled() → readOnly() so field looks active (not grayed out)
  while still preventing manual editing; $set() from discount live works
- Add ru/en translations: Statut plată, Reducere %

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Filament/Tenant/Resources/WorkOrderResource.php

@@ -148,9 +148,9 @@ class WorkOrderResource extends Resource
             Schemas\Components\Section::make(__('Plată & total'))
                 ->columns(3)->collapsible()->collapsed()->compact()
                 ->schema([
-                    Forms\Components\Select::make('pay_status')->options(\App\Support\I18n::opts(WorkOrder::PAY_STATUSES))->default('unpaid')->required(),
+                    Forms\Components\Select::make('pay_status')->label(__('Statut plată'))->options(\App\Support\I18n::opts(WorkOrder::PAY_STATUSES))->default('unpaid')->required(),
                     Forms\Components\TextInput::make('discount_pct')
-                        ->label(__('Discount %'))
+                        ->label(__('Reducere %'))
                         ->numeric()
                         ->default(0)
                         ->live(onBlur: true)
@@ -173,7 +173,7 @@ class WorkOrderResource extends Resource
                         ->placeholder(__('Ex: 25'))
                         ->helperText(__('Doar pentru cazuri speciale. Lasă gol → folosește marja mecanicului.'))
                         ->visible(fn () => auth()->user()?->canDo(\App\Auth\Permissions::FINANCE_VIEW_INTERNAL_MARGIN) ?? false),
-                    Forms\Components\TextInput::make('total')->label(__('Total'))->numeric()->disabled()->dehydrated(false),
+                    Forms\Components\TextInput::make('total')->label(__('Total'))->numeric()->readOnly()->dehydrated(false),
                     Forms\Components\Toggle::make('approved')->label(__('Aprobat de client')),
                     Forms\Components\DatePicker::make('closed_at')->label(__('Închis')),
                 ]),