fix(api) : register #[ApiFilter] services by mapping module entity paths

Modular monolith moved entities out of src/Entity into src/Module/*/Domain/Entity
without configuring api_platform.mapping.paths. Resources stayed discoverable via
service autoconfiguration, but annotated filter services were registered only for
classes found in resource_class_directories (the now-empty default src/Entity and
src/ApiResource), so every #[ApiFilter] (SearchFilter, BooleanFilter, OrderFilter,
DateFilter) was silently ignored across the whole API — collection filters never
narrowed results (my-tasks showed all users' tasks, time entries leaked across
users, directory would leak per-client data).

Declare the seven module entity directories under mapping.paths so the annotated
filter services are generated again.

config/packages/api_platform.yaml

@@ -1,6 +1,20 @@
 api_platform:
     title: Lesstime API
     version: 1.0.0
+    # Modular monolith: entities (and their #[ApiFilter] attributes) live under
+    # src/Module/*/Domain/Entity, not the default src/Entity. Resources are still
+    # discovered via service autoconfiguration, but #[ApiFilter] services are only
+    # registered for classes found in these paths — without them, every filter is
+    # silently ignored. Decoupled ApiResource classes stay discovered via tags.
+    mapping:
+        paths:
+            - '%kernel.project_dir%/src/Module/Core/Domain/Entity'
+            - '%kernel.project_dir%/src/Module/TimeTracking/Domain/Entity'
+            - '%kernel.project_dir%/src/Module/ProjectManagement/Domain/Entity'
+            - '%kernel.project_dir%/src/Module/Absence/Domain/Entity'
+            - '%kernel.project_dir%/src/Module/Directory/Domain/Entity'
+            - '%kernel.project_dir%/src/Module/Mail/Domain/Entity'
+            - '%kernel.project_dir%/src/Module/Integration/Domain/Entity'
     formats:
         jsonld: ['application/ld+json']
         json: ['application/json']