test(api) : add comprehensive API test suite (161 tests)

- Add AbstractApiTestCase with auth helpers and entity factories
- Add tests for all entities: Machine, Piece, Composant, Product, Site,
  ModelType, Constructeur, CustomField, CustomFieldValue, Document,
  MachineComponentLink, MachinePieceLink, MachineProductLink, Profile
- Add controller tests: CommentController, EntityHistory
- Add HealthCheck, Filter, Pagination, Validation, Session tests
- Test auth (401), authorization (403), CRUD, and edge cases

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/Api/HealthCheckTest.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Api;
+
+use App\Tests\AbstractApiTestCase;
+
+/**
+ * @internal
+ */
+class HealthCheckTest extends AbstractApiTestCase
+{
+    public function testHealthEndpointPublicReturnsMinimalInfo(): void
+    {
+        $client = $this->createUnauthenticatedClient();
+        $client->request('GET', '/api/health');
+
+        $this->assertResponseIsSuccessful();
+        $this->assertJsonContains(['status' => 'ok']);
+
+        $data = $client->getResponse()->toArray();
+        $this->assertArrayNotHasKey('php', $data);
+        $this->assertArrayNotHasKey('checks', $data);
+        $this->assertArrayNotHasKey('memory_mb', $data);
+    }
+
+    public function testHealthEndpointAdminReturnsFullInfo(): void
+    {
+        $client = $this->createAdminClient();
+        $client->request('GET', '/api/health');
+
+        $this->assertResponseIsSuccessful();
+        $this->assertJsonContains([
+            'status' => 'ok',
+            'checks' => [
+                'database' => [
+                    'status' => 'ok',
+                ],
+            ],
+        ]);
+    }
+}