fix(assessments): enable engine by default and wire into live UI

The assessment engine was built but opt-in and hidden: flag defaulted
off, no sidebar entry, and no settings toggle. Default assessments_engine
on, auto-seed catalog when empty, add Settings toggle and Assessments
nav, and surface guidance from the patients list.

app/Http/Controllers/Care/PatientController.php

@@ -102,7 +102,11 @@ class PatientController extends Controller
         $suiteEmailReady = app(\App\Services\Billing\PlatformEmailClient::class)->isConfigured();
         $suiteSmsReady = app(\App\Services\Billing\PlatformSmsClient::class)->isConfigured();
 
-        $assessmentsEnabled = app(CareFeatures::class)->enabled($organization, CareFeatures::ASSESSMENTS_ENGINE);
+        $careFeatures = app(CareFeatures::class);
+        $assessmentsEnabled = $careFeatures->enabled($organization, CareFeatures::ASSESSMENTS_ENGINE);
+        if ($assessmentsEnabled) {
+            $careFeatures->ensureAssessmentCatalog();
+        }
         $canViewAssessments = $assessmentsEnabled && $permissions->can($member, 'assessments.view');
         $canCaptureAssessment = $assessmentsEnabled && (
             $permissions->can($member, 'assessments.capture')