feat(sync) : add ModelTypeSyncService orchestrator and controller with tests

Implement the sync orchestrator that delegates to tagged strategies via
AutowireIterator, and the HTTP controller exposing sync-preview and sync
endpoints with transaction wrapping and role-based access control.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config/services.yaml

@@ -56,7 +56,7 @@ when@test:
             autoconfigure: true
             public: true
 
-        # App\Service\ModelTypeSyncService:
-        #     autowire: true
-        #     autoconfigure: true
-        #     public: true
+        App\Service\ModelTypeSyncService:
+            autowire: true
+            autoconfigure: true
+            public: true