feat(integration) : migrate Gitea/BookStack/Zimbra/Share into module (back)

LST-68 (2.6) backend. Behaviour-preserving move of the external integrations
into src/Module/Integration/. All 26 routes and securities unchanged.

- 5 entities (4 *Configuration singletons + TaskBookStackLink) + 5 repositories
  (Domain interfaces + Doctrine impls, bound). TaskBookStackLink.task now
  references TaskInterface (contract).
- Domain (FileSource interface, SharePathResolver, share DTOs + exceptions);
  Infrastructure (GiteaApiService, BookStackApiService, SmbFileSource, 15
  ApiResources, 21 State, 4 Share controllers).
- Cross-module couplings via abstractions: CalDavService (PM) injects
  ZimbraConfigurationRepositoryInterface; PM TaskDocument consumers repointed
  to the module's FileSource/SharePathResolver; Gitea/BookStack State load
  tasks via TaskRepositoryInterface (concrete Project read for integration
  fields — documented). ZimbraTestConnection keeps CalDavService (no build
  cycle). TokenEncryptor stays shared.
- IntegrationModule registered; doctrine mapping added.
- #[Auditable] + Timestampable on the 4 Configuration entities (additive
  migration on the 4 *_configuration tables).

163 tests green, container compiles (no cycle), no route regression, cs-fixer clean.

src/Module/Integration/Infrastructure/ApiPlatform/Resource/GiteaPullRequest.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Module\Integration\Infrastructure\ApiPlatform\Resource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\GetCollection;
+use App\Module\Integration\Infrastructure\ApiPlatform\State\GiteaPullRequestProvider;
+use Symfony\Component\Serializer\Attribute\Groups;
+
+#[ApiResource(
+    operations: [
+        new GetCollection(
+            uriTemplate: '/tasks/{taskId}/gitea/pull-requests',
+            normalizationContext: ['groups' => ['gitea_pr:read']],
+            provider: GiteaPullRequestProvider::class,
+            security: "is_granted('ROLE_USER')",
+        ),
+    ],
+)]
+final class GiteaPullRequest
+{
+    #[Groups(['gitea_pr:read'])]
+    public int $number = 0;
+
+    #[Groups(['gitea_pr:read'])]
+    public string $title = '';
+
+    #[Groups(['gitea_pr:read'])]
+    public string $state = '';
+
+    #[Groups(['gitea_pr:read'])]
+    public bool $merged = false;
+
+    #[Groups(['gitea_pr:read'])]
+    public string $headBranch = '';
+
+    #[Groups(['gitea_pr:read'])]
+    public string $author = '';
+
+    #[Groups(['gitea_pr:read'])]
+    public string $url = '';
+
+    /**
+     * @var array<array{context: string, status: string, target_url: string}>
+     */
+    #[Groups(['gitea_pr:read'])]
+    public array $ciStatuses = [];
+}