feat(directory) : migrate Client into Directory module (back)

LST-58 (2.4), part 1/2 — Client move. Prospect + repertoire front are pending
the product spec and will be added on this branch afterward.

- Client entity moved to src/Module/Directory/Domain/Entity; repository split
  into Domain/Repository/ClientRepositoryInterface + Doctrine impl (bound in
  services.yaml). 5 client MCP tools moved to Infrastructure/Mcp/Tool, now
  injecting the interface.
- resolve_target_entities ClientInterface repointed to Directory\Client;
  Directory mapping added; DirectoryModule registered (id directory, 2 RBAC
  perms). Client.projects relation now uses ProjectInterface -> Directory no
  longer depends on ProjectManagement.
- ProjectManagement Create/UpdateProjectTool inject Directory's
  ClientRepositoryInterface; Serializer and fixtures repointed.
- Garde-fous: #[Auditable] + Timestampable/Blamable on Client (additive
  migration: created_at/updated_at + created_by/updated_by FK ON DELETE SET
  NULL + COMMENT).

161 tests green, mapping valid, no API route regression, cs-fixer clean.

src/Module/ProjectManagement/Infrastructure/Mcp/Tool/Project/CreateProjectTool.php

@@ -5,8 +5,8 @@ declare(strict_types=1);
 namespace App\Module\ProjectManagement\Infrastructure\Mcp\Tool\Project;
 
 use App\Mcp\Tool\Serializer;
+use App\Module\Directory\Domain\Repository\ClientRepositoryInterface;
 use App\Module\ProjectManagement\Domain\Entity\Project;
-use App\Repository\ClientRepository;
 use Doctrine\ORM\EntityManagerInterface;
 use InvalidArgumentException;
 use Mcp\Capability\Attribute\McpTool;
@@ -20,7 +20,7 @@ class CreateProjectTool
 {
     public function __construct(
         private readonly EntityManagerInterface $entityManager,
-        private readonly ClientRepository $clientRepository,
+        private readonly ClientRepositoryInterface $clientRepository,
         private readonly Security $security,
     ) {}
 
@@ -46,7 +46,7 @@ class CreateProjectTool
             $project->setColor($color);
         }
         if (null !== $clientId) {
-            $client = $this->clientRepository->find($clientId);
+            $client = $this->clientRepository->findById($clientId);
             if (null === $client) {
                 throw new InvalidArgumentException(sprintf('Client with ID %d not found.', $clientId));
             }

src/Module/ProjectManagement/Infrastructure/Mcp/Tool/Project/UpdateProjectTool.php

@@ -5,8 +5,8 @@ declare(strict_types=1);
 namespace App\Module\ProjectManagement\Infrastructure\Mcp\Tool\Project;
 
 use App\Mcp\Tool\Serializer;
+use App\Module\Directory\Domain\Repository\ClientRepositoryInterface;
 use App\Module\ProjectManagement\Domain\Repository\ProjectRepositoryInterface;
-use App\Repository\ClientRepository;
 use Doctrine\ORM\EntityManagerInterface;
 use InvalidArgumentException;
 use Mcp\Capability\Attribute\McpTool;
@@ -20,7 +20,7 @@ class UpdateProjectTool
 {
     public function __construct(
         private readonly ProjectRepositoryInterface $projectRepository,
-        private readonly ClientRepository $clientRepository,
+        private readonly ClientRepositoryInterface $clientRepository,
         private readonly EntityManagerInterface $entityManager,
         private readonly Security $security,
     ) {}
@@ -57,7 +57,7 @@ class UpdateProjectTool
             $project->setColor($color);
         }
         if (null !== $clientId) {
-            $client = $this->clientRepository->find($clientId);
+            $client = $this->clientRepository->findById($clientId);
             if (null === $client) {
                 throw new InvalidArgumentException(sprintf('Client with ID %d not found.', $clientId));
             }