feat : add document upload processor, download controller and cleanup listener

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/services.yaml

@@ -7,6 +7,7 @@
 # Put parameters here that don't need to change on each machine where the app is deployed
 # https://symfony.com/doc/current/best_practices.html#use-parameters-for-application-configuration
 parameters:
+    task_document_upload_dir: '%kernel.project_dir%/var/uploads/documents'
 
 imports:
     - { resource: version.yaml }
@@ -24,3 +25,15 @@ services:
 
     # add more service definitions when explicit configuration is needed
     # please note that last definitions always *replace* previous ones
+
+    App\EventListener\TaskDocumentListener:
+        arguments:
+            $uploadDir: '%task_document_upload_dir%'
+
+    App\State\TaskDocumentProcessor:
+        arguments:
+            $uploadDir: '%task_document_upload_dir%'
+
+    App\Controller\TaskDocumentDownloadController:
+        arguments:
+            $uploadDir: '%task_document_upload_dir%'