chore(docker): migrate static and media to managed, update comments

The static volume is now Docker-managed, removing the need for Ansible to create the host path. Media volume comments updated to reflect S3 storage usage (USE_LOCAL_STORAGE=False) and that the volume is effectively unused in production.

docker-compose.yaml

@@ -386,19 +386,9 @@ services:
 
 volumes:
   # Static files written by collectstatic (run by the init sidecar on every
-  # `up`). Bind-mounted from the host so nginx can serve them directly.
-  # The host path is created by Ansible before `docker compose up`.
+  # `up`). Docker-managed volume — no host path needed; storage is minimal
+  # and auto-regenerated on every `up`.
   static:
-    driver: local
-    driver_opts:
-      type: none
-      device: ${STATIC_ROOT}
-      o: bind
-  # Media files. Production uses USE_LOCAL_STORAGE=False so this is mostly
-  # empty — kept for any path that writes to MEDIA_ROOT directly.
+  # Media files. Production uses USE_LOCAL_STORAGE=False (S3) so this volume
+  # is effectively unused — kept so the mount points in services don't break.
   media:
-    driver: local
-    driver_opts:
-      type: none
-      device: ${MEDIA_ROOT}
-      o: bind