feat(project-management) : migrate core Projects/Tasks domain into module (back)

Tranche 2 of LST-65. Mechanical, behaviour-preserving move of the core
business domain into src/Module/ProjectManagement/. API operations,
securities, uriTemplates and the 38 MCP tool names are all unchanged.

- 10 entities + 2 enums moved to Domain/{Entity,Enum}; intra-module
  relations stay concrete, cross-module relations go through contracts
  (Project.client -> ClientInterface, Task/TaskDocument users ->
  UserInterface).
- 9 repositories split into Domain/Repository interfaces + Doctrine impls,
  bound in services.yaml; consumers inject the interfaces. find() kept off
  the interfaces (ServiceEntityRepository ?object compat) -> findById().
- State (7), MCP tools (38), controller, CalDavService/RecurrenceCalculator,
  3 Doctrine listeners and SwitchWorkflowOutput moved under Infrastructure/.
- doctrine.yaml: ProjectManagement mapping + resolve_target_entities of the
  3 module contracts repointed to the module (ClientInterface stays legacy).
- ProjectManagementModule registered (id project-management, 4 RBAC perms,
  not re-wired); sidebar my-tasks/projects gated by the module.
- Legacy not-yet-modularised consumers (Mail/Gitea/BookStack, Serializer,
  fixtures, tests) swapped to the module FQCN — transitional coupling to be
  cleaned in 2.4/2.5/2.6.

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

config/packages/doctrine.yaml

@@ -22,9 +22,9 @@ doctrine:
         auto_mapping: true
         resolve_target_entities:
             App\Shared\Domain\Contract\UserInterface: App\Module\Core\Domain\Entity\User
-            App\Shared\Domain\Contract\ProjectInterface: App\Entity\Project
-            App\Shared\Domain\Contract\TaskInterface: App\Entity\Task
-            App\Shared\Domain\Contract\TaskTagInterface: App\Entity\TaskTag
+            App\Shared\Domain\Contract\ProjectInterface: App\Module\ProjectManagement\Domain\Entity\Project
+            App\Shared\Domain\Contract\TaskInterface: App\Module\ProjectManagement\Domain\Entity\Task
+            App\Shared\Domain\Contract\TaskTagInterface: App\Module\ProjectManagement\Domain\Entity\TaskTag
             App\Shared\Domain\Contract\ClientInterface: App\Entity\Client
         mappings:
             App:
@@ -43,6 +43,11 @@ doctrine:
                 is_bundle: false
                 dir: '%kernel.project_dir%/src/Module/TimeTracking/Domain/Entity'
                 prefix: 'App\Module\TimeTracking\Domain\Entity'
+            ProjectManagement:
+                type: attribute
+                is_bundle: false
+                dir: '%kernel.project_dir%/src/Module/ProjectManagement/Domain/Entity'
+                prefix: 'App\Module\ProjectManagement\Domain\Entity'
         controller_resolver:
             auto_mapping: false