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/Resources/ActivityResource.php

@@ -48,8 +48,8 @@ class ActivityResource extends Resource
     {
         return $table
             ->columns([
-                Tables\Columns\TextColumn::make('created_at')->label('Când')->dateTime('d.m.Y H:i')->sortable(),
-                Tables\Columns\TextColumn::make('description')->label('Acțiune')->badge()
+                Tables\Columns\TextColumn::make('created_at')->label(__('Când'))->dateTime('d.m.Y H:i')->sortable(),
+                Tables\Columns\TextColumn::make('description')->label(__('Acțiune'))->badge()
                     ->colors([
                         'success' => ['creat'],
                         'info' => ['modificat'],
@@ -57,12 +57,12 @@ class ActivityResource extends Resource
                         'warning' => ['restaurat'],
                     ]),
                 Tables\Columns\TextColumn::make('subject_type')
-                    ->label('Tip')
+                    ->label(__('Tip'))
                     ->formatStateUsing(fn ($s) => $s ? class_basename($s) : '—'),
-                Tables\Columns\TextColumn::make('subject_id')->label('ID')->placeholder('—'),
-                Tables\Columns\TextColumn::make('causer.name')->label('De către')->placeholder('Sistem'),
+                Tables\Columns\TextColumn::make('subject_id')->label(__('ID'))->placeholder('—'),
+                Tables\Columns\TextColumn::make('causer.name')->label(__('De către'))->placeholder(__('Sistem')),
                 Tables\Columns\TextColumn::make('attribute_changes')
-                    ->label('Detalii')
+                    ->label(__('Detalii'))
                     ->formatStateUsing(function ($state) {
                         if (! $state) return '—';
                         $arr = is_string($state) ? json_decode($state, true) : $state;
@@ -75,10 +75,10 @@ class ActivityResource extends Resource
             ])
             ->filters([
                 Tables\Filters\SelectFilter::make('description')
-                    ->label('Acțiune')
+                    ->label(__('Acțiune'))
                     ->options(['creat' => 'creat', 'modificat' => 'modificat', 'șters' => 'șters']),
                 Tables\Filters\Filter::make('today')
-                    ->label('Astăzi')
+                    ->label(__('Astăzi'))
                     ->query(fn ($q) => $q->whereDate('created_at', today())),
             ])
             ->defaultSort('created_at', 'desc')