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/ValidationTest.php

@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Api;
+
+use App\Tests\AbstractApiTestCase;
+
+/**
+ * @internal
+ */
+class ValidationTest extends AbstractApiTestCase
+{
+    public function testConstructeurRequiresName(): void
+    {
+        $client = $this->createGestionnaireClient();
+        $client->request('POST', '/api/constructeurs', [
+            'headers' => ['Content-Type' => 'application/ld+json'],
+            'json'    => ['email' => 'no-name@test.com'],
+        ]);
+
+        $this->assertResponseStatusCodeSame(422);
+    }
+
+    public function testSiteRequiresName(): void
+    {
+        $client = $this->createGestionnaireClient();
+        $client->request('POST', '/api/sites', [
+            'headers' => ['Content-Type' => 'application/ld+json'],
+            'json'    => ['contactCity' => 'Paris'],
+        ]);
+
+        $this->assertResponseStatusCodeSame(422);
+    }
+
+    public function testMachineRequiresSite(): void
+    {
+        $client = $this->createGestionnaireClient();
+        $client->request('POST', '/api/machines', [
+            'headers' => ['Content-Type' => 'application/ld+json'],
+            'json'    => ['name' => 'Machine sans site'],
+        ]);
+
+        $this->assertResponseStatusCodeSame(422);
+    }
+
+    public function testProfileRequiresFirstAndLastName(): void
+    {
+        $client = $this->createAdminClient();
+        $client->request('POST', '/api/profiles', [
+            'headers' => ['Content-Type' => 'application/ld+json'],
+            'json'    => ['email' => 'missing@names.com'],
+        ]);
+
+        $this->assertResponseStatusCodeSame(422);
+    }
+
+    public function testDuplicateConstructeurName(): void
+    {
+        $this->createConstructeur('Siemens');
+
+        $client = $this->createGestionnaireClient();
+        $client->request('POST', '/api/constructeurs', [
+            'headers' => ['Content-Type' => 'application/ld+json'],
+            'json'    => ['name' => 'Siemens'],
+        ]);
+
+        $this->assertResponseStatusCodeSame(422);
+    }
+}