Deploy 1: i18n + Notifications + Global Search + Tests

- SetLocale middleware (ro/ru/en, session-first, user-persisted)
- Lang switcher in topbar (Filament render hook USER_MENU_BEFORE)
- POST /locale/{lang} route persists to user.locale + session
- Database notifications enabled on tenant panel (30s polling)
- GlobalSearch (Cmd+K / Ctrl+K) on Client, Vehicle, WorkOrder, Lead, Part
- Tests: TenantIsolation (4), AuthFlow (2), WorkOrderCalc (3), MarkupRule (3)

routes/web.php

@@ -24,6 +24,18 @@ Route::get('/', function () {
     return redirect('/admin');
 });
 
+// Locale switch — POST /locale/{lang} sets session and persists to user.
+Route::post('/locale/{lang}', function (Request $request, string $lang) {
+    if (! in_array($lang, ['ro', 'ru', 'en'], true)) {
+        abort(404);
+    }
+    $request->session()->put('locale', $lang);
+    if ($u = $request->user()) {
+        $u->forceFill(['locale' => $lang])->saveQuietly();
+    }
+    return back();
+})->name('locale.switch');
+
 // PWA — manifest dinamic per tenant.
 Route::get('/manifest.json', function (Request $request) {
     $tenant = app(TenantManager::class)->current();