feat(absences) : outils MCP CRUD pour les absences

Expose le module Absences via le serveur MCP et comble les trous CRUD
existants (projets, groupes, métadonnées de tâches, clients, users RH).

Absences (réutilise AbsenceDayCalculator + AbsenceBalanceService pour ne
pas contourner la logique de soldes) :
- list/get/create/review/cancel/delete-absence-request
- list/update-absence-policy, list/update-absence-balance
- create-absence-request prend un userId explicite (agir au nom d'un employé) ;
  review/cancel maintiennent les soldes (pending/taken) cohérents
- AbsenceRequestRepository::findFiltered pour les filtres de liste

Trous CRUD comblés :
- delete-project, delete-group
- CRUD tag, effort, priority
- CRUD status (couplé au workflow, avec category)
- CRUD client, get/update-user (champs RH, sans password ni roles)

Sérialisation centralisée (Serializer::absenceRequest/Policy/Balance/client/userFull).
Instructions MCP (mcp.yaml) mises à jour : statuts par workflow + domaine absences.

Tests : tests/Functional/Mcp/AbsenceRequestLifecycleTest (création / approbation /
annulation admin) vérifient le cycle complet et la cohérence des soldes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

config/packages/mcp.yaml

@@ -6,8 +6,14 @@ mcp:
         This server provides access to the Lesstime project management system.
         You can list/create/update/delete projects, tasks, and time entries.
         Tasks belong to projects and have statuses, priorities, efforts, tags, and groups.
-        Statuses, priorities, efforts, and tags are GLOBAL (shared across all projects).
+        Priorities, efforts, and tags are GLOBAL (shared across all projects).
+        Statuses belong to a WORKFLOW (not global) — use list-workflows and list-statuses
+        to see how they group; create-status requires a workflowId and a category.
         Groups are PER-PROJECT (each group belongs to one project).
+        Absences: manage employee leave with absence-request tools (list/get/create/review/
+        cancel/delete), absence-policy tools (list/update) and absence-balance tools
+        (list/update). create-absence-request takes an explicit userId to act on behalf of
+        an employee; review/cancel keep the leave balances consistent (pending/taken).
         Time entries track work duration and can be linked to projects and tasks.
         Use list-statuses, list-priorities, list-efforts, list-tags, list-groups to discover
         available metadata before creating or updating tasks.