feat(system): page Status avec endpoint API Platform et composants Vue

- Nouveau domaine System/Domain/Model/SystemStatus (value object)
- QueryHandler agrégeant métriques mangas, chapitres, jobs (global/24h/7j), stockage et sources
- Endpoint GET /api/system/status via API Platform (singleton)
- Calcul de l'espace disque par RecursiveDirectoryIterator sur public/images
- Page Vue /system/status avec 6 cards (Mangas, Chapitres, Jobs, Stockage, Sources, Système)
- Nettoyage du router : suppression des PlaceholderComponent et routes placeholder
- Sidebar : suppression des entrées sans page réelle

config/packages/api_platform.yaml

@@ -34,5 +34,6 @@ api_platform:
             - '%kernel.project_dir%/src/Domain/Reader/Infrastructure/ApiPlatform/Resource'
             - '%kernel.project_dir%/src/Domain/Conversion/Infrastructure/ApiPlatform/Resource'
             - '%kernel.project_dir%/src/Domain/Shared/Infrastructure/ApiPlatform/Resource'
+            - '%kernel.project_dir%/src/Domain/System/Infrastructure/ApiPlatform/Resource'
     patch_formats:
         json: ['application/merge-patch+json']

config/services.yaml

@@ -200,3 +200,12 @@ services:
     # Import Domain API Platform Services
     App\Domain\Import\Infrastructure\ApiPlatform\State\Processor\AnalyzeFilenameStateProcessor: ~
     App\Domain\Import\Infrastructure\ApiPlatform\State\Processor\ImportFileStateProcessor: ~
+
+    # System Domain
+    App\Domain\System\Domain\Contract\Repository\SystemStatusRepositoryInterface:
+        alias: App\Domain\System\Infrastructure\Persistence\Repository\DoctrineSystemStatusRepository
+
+    App\Domain\System\Application\QueryHandler\GetSystemStatusQueryHandler:
+        arguments:
+            $mangaDataPath: '%env(resolve:MANGA_DATA_PATH)%'
+            $imagesStoragePath: '%kernel.project_dir%/public/images'