feat: AI model selector + i18n nav labels (RU/EN) on new modules

AI model selector:
- AiAssistantService::MODEL_DEFAULTS and MODEL_OPTIONS const tables (3 picks per
  provider: Claude Opus 4.7 / Sonnet 4.6 / Haiku 4.5, OpenAI 4o / 4o-mini,
  Gemini 1.5 Pro / Flash). Default upgraded from Sonnet 4.5 → Sonnet 4.6.
- modelFor(provider, company?) resolves tenant override > global default.
- All 8 hardcoded model strings replaced with modelFor() across callClaude
  (chat with tool-use), callOpenAI, callGemini (chat), postClaude/postOpenAI/
  postGemini (single-shot), and OcrInvoiceService.
- Settings page adds 3 model selectors per provider with persistence at
  settings.ai.models.{claude,gpt,gemini}.

i18n nav labels:
- TireSet / Bodyshop / Subcontractor / SubcontractJob / PricingCoefficient /
  ShopCustomer resources: getNavigationLabel / getNavigationGroup /
  getModelLabel / getPluralModelLabel return __()-wrapped strings.
- 20 keys added to lang/ru.json and lang/en.json.

Tests (4 new): default model, tenant override wins, unknown provider falls
back to claude default, options dictionary contains each default key.

Full suite: 134 passed.

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

app/Filament/Tenant/Resources/BodyshopJobResource.php

@@ -134,6 +134,27 @@ class BodyshopJobResource extends Resource
         ];
     }
 
+
+    public static function getNavigationLabel(): string
+    {
+        return __('Tinichigerie / Detailing');
+    }
+
+    public static function getNavigationGroup(): ?string
+    {
+        return __('Tinichigerie');
+    }
+
+    public static function getModelLabel(): string
+    {
+        return __('lucrare caroserie');
+    }
+
+    public static function getPluralModelLabel(): string
+    {
+        return __('lucrări caroserie');
+    }
+
     public static function getPages(): array
     {
         return [

app/Filament/Tenant/Resources/PricingCoefficientResource.php

@@ -97,6 +97,27 @@ class PricingCoefficientResource extends Resource
             ->defaultSort('priority');
     }
 
+
+    public static function getNavigationLabel(): string
+    {
+        return __('Coeficienți preț');
+    }
+
+    public static function getNavigationGroup(): ?string
+    {
+        return __('Depozit');
+    }
+
+    public static function getModelLabel(): string
+    {
+        return __('coeficient');
+    }
+
+    public static function getPluralModelLabel(): string
+    {
+        return __('coeficienți preț');
+    }
+
     public static function getPages(): array
     {
         return [

app/Filament/Tenant/Resources/ShopCustomerResource.php

@@ -93,6 +93,27 @@ class ShopCustomerResource extends Resource
         ];
     }
 
+
+    public static function getNavigationLabel(): string
+    {
+        return __('Clienți magazin');
+    }
+
+    public static function getNavigationGroup(): ?string
+    {
+        return __('Magazin');
+    }
+
+    public static function getModelLabel(): string
+    {
+        return __('client magazin');
+    }
+
+    public static function getPluralModelLabel(): string
+    {
+        return __('clienți magazin');
+    }
+
     public static function getPages(): array
     {
         return [

app/Filament/Tenant/Resources/SubcontractJobResource.php

@@ -122,6 +122,27 @@ class SubcontractJobResource extends Resource
             ->defaultSort('created_at', 'desc');
     }
 
+
+    public static function getNavigationLabel(): string
+    {
+        return __('Lucrări terți');
+    }
+
+    public static function getNavigationGroup(): ?string
+    {
+        return __('Subcontractare');
+    }
+
+    public static function getModelLabel(): string
+    {
+        return __('lucrare terți');
+    }
+
+    public static function getPluralModelLabel(): string
+    {
+        return __('lucrări terți');
+    }
+
     public static function getPages(): array
     {
         return [

app/Filament/Tenant/Resources/SubcontractorResource.php

@@ -73,6 +73,27 @@ class SubcontractorResource extends Resource
             ->defaultSort('name');
     }
 
+
+    public static function getNavigationLabel(): string
+    {
+        return __('Subcontractori');
+    }
+
+    public static function getNavigationGroup(): ?string
+    {
+        return __('Subcontractare');
+    }
+
+    public static function getModelLabel(): string
+    {
+        return __('subcontractor');
+    }
+
+    public static function getPluralModelLabel(): string
+    {
+        return __('subcontractori');
+    }
+
     public static function getPages(): array
     {
         return [

app/Filament/Tenant/Resources/TireSetResource.php

@@ -185,6 +185,27 @@ class TireSetResource extends Resource
         ];
     }
 
+
+    public static function getNavigationLabel(): string
+    {
+        return __('Seturi anvelope');
+    }
+
+    public static function getNavigationGroup(): ?string
+    {
+        return __('Anvelope');
+    }
+
+    public static function getModelLabel(): string
+    {
+        return __('set anvelope');
+    }
+
+    public static function getPluralModelLabel(): string
+    {
+        return __('seturi anvelope');
+    }
+
     public static function getPages(): array
     {
         return [