feat(i18n): wrap 1103 hardcoded UI strings across Filament with __()

- Convert static $modelLabel/$pluralModelLabel/$title to getter methods
- Wrap ->label()/->placeholder()/->helperText()/->description()/->title()/->body() args
- Wrap Section::make()/Fieldset::make()/Notification::make()->title() args
- Fix RelationManagers::getTitle() signature to match parent (Model, string)
- Fix Pages::getTitle() to instance method (BasePage::getTitle is non-static)
- Extend lang/ru.json + lang/en.json with 700+ common terms; identity fallback for the rest
- Remove duplicate getters in 5 resources that had manual getModelLabel already

All 306 tests pass. Missing translations fall back to the RO key so the UI never breaks.

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

app/Filament/Tenant/Pages/ApiTokens.php

@@ -23,7 +23,12 @@ class ApiTokens extends Page
 
     protected static ?int $navigationSort = 95;
 
-    protected static ?string $title = 'API Tokens';
+    protected static ?string $title = null;
+
+    public function getTitle(): string
+    {
+        return __('API Tokens');
+    }
 
     protected string $view = 'filament.tenant.pages.api-tokens';
 
@@ -46,13 +51,13 @@ class ApiTokens extends Page
     {
         return [
             Actions\Action::make('create')
-                ->label('Generează token')
+                ->label(__('Generează token'))
                 ->icon('heroicon-m-plus')
                 ->schema([
                     Forms\Components\TextInput::make('name')
-                        ->label('Nume (descriere)')
+                        ->label(__('Nume (descriere)'))
                         ->required()
-                        ->placeholder('ex: app-mobil, integrare-erp'),
+                        ->placeholder(__('ex: app-mobil, integrare-erp')),
                 ])
                 ->action(function (array $data) {
                     $u = auth()->user();
@@ -60,8 +65,8 @@ class ApiTokens extends Page
                     $token = $u->createToken($data['name']);
                     $this->newToken = $token->plainTextToken;
                     Notification::make()
-                        ->title('Token generat!')
-                        ->body('Copiază token-ul ACUM — nu va mai fi afișat.')
+                        ->title(__('Token generat!'))
+                        ->body(__('Copiază token-ul ACUM — nu va mai fi afișat.'))
                         ->success()
                         ->persistent()
                         ->send();