feat(absence) : migrate Absence domain into module (back)

LST-66 (2.3) backend. Behaviour-preserving move of the absences domain into
src/Module/Absence/. API operations, securities, routes and the 10 MCP tool
names are unchanged.

- 3 entities + 3 enums moved to Domain/{Entity,Enum}; user relations stay on
  UserInterface. 3 repositories split into Domain/Repository interfaces +
  Doctrine impls (bound in services.yaml); find() kept off interfaces
  (findById instead).
- Pure services (AbsenceDayCalculator, PublicHolidayProvider) -> Domain/Service;
  AbsenceBalanceService -> Application/Service; State (5), controllers (5),
  10 MCP tools and AccrueLeaveCommand -> Infrastructure/.
- New LeaveProfileInterface contract (Shared) exposes the HR getters used by
  AbsenceBalanceService/AccrueLeaveCommand; User implements it -> Absence no
  longer imports the concrete Core User. MCP tools/command inject
  UserRepositoryInterface (findById) instead of the concrete repository.
- Timestampable/Blamable added to AbsenceBalance and AbsencePolicy (additive
  migration: created_at/updated_at + created_by/updated_by FK ON DELETE SET
  NULL + COMMENT). AbsenceRequest untouched (already has createdAt/reviewedAt).
- AbsenceModule registered (id absence, 4 RBAC perms, not re-wired); doctrine
  mapping added; team-absences sidebar item gated by the module.

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

config/services.yaml

@@ -57,11 +57,11 @@ services:
         arguments:
             $avatarUploadDir: '%avatar_upload_dir%'
 
-    App\Controller\Absence\AbsenceJustificationUploadController:
+    App\Module\Absence\Infrastructure\Controller\AbsenceJustificationUploadController:
         arguments:
             $uploadDir: '%absence_justification_upload_dir%'
 
-    App\Controller\Absence\AbsenceJustificationDownloadController:
+    App\Module\Absence\Infrastructure\Controller\AbsenceJustificationDownloadController:
         arguments:
             $uploadDir: '%absence_justification_upload_dir%'
 
@@ -93,4 +93,10 @@ services:
 
     App\Module\ProjectManagement\Domain\Repository\TaskRecurrenceRepositoryInterface: '@App\Module\ProjectManagement\Infrastructure\Doctrine\DoctrineTaskRecurrenceRepository'
 
+    App\Module\Absence\Domain\Repository\AbsenceRequestRepositoryInterface: '@App\Module\Absence\Infrastructure\Doctrine\DoctrineAbsenceRequestRepository'
+
+    App\Module\Absence\Domain\Repository\AbsencePolicyRepositoryInterface: '@App\Module\Absence\Infrastructure\Doctrine\DoctrineAbsencePolicyRepository'
+
+    App\Module\Absence\Domain\Repository\AbsenceBalanceRepositoryInterface: '@App\Module\Absence\Infrastructure\Doctrine\DoctrineAbsenceBalanceRepository'
+
     App\Shared\Domain\Contract\NotifierInterface: '@App\Module\Core\Infrastructure\Notifier'