deploy(prod): NOTIFY pgrst reload schema after migrations + after rollback

Post-deploy, PostgREST keeps its pre-migration pg_proc snapshot and
404s any RPC added in the just-applied migrations until the rest
container restarts. Confirmed on 2026-05-18 after migration 026
(set_item_frequency_weight + purge_item_frequency) — the "Purgar"
button in /collective/manage returned "Could not find the function
public.purge_item_frequency in the schema cache".

`NOTIFY pgrst, 'reload schema'` triggers the same reload path the
container would do on restart, but without a 2s blip in flight requests.
Added at the end of the migration loop in deploy-erosi.sh, and at the
end of the rebuild step in rollback-erosi.sh (rollback can change RPC
shapes too).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

infra/scripts/rollback-erosi.sh

@@ -175,6 +175,13 @@ cd /opt/colectivo
 GIT_SHA="$GIT_SHA" docker compose --env-file .env -f infra/docker-compose.erosi.yml \
 	build --build-arg GIT_SHA="$GIT_SHA" app
 GIT_SHA="$GIT_SHA" docker compose --env-file .env -f infra/docker-compose.erosi.yml up -d
+
+# Reload PostgREST schema cache so any RPCs that changed shape between
+# the rolled-back schema and the current rest container snapshot are
+# resolved. Mirrors the same step at the end of deploy-erosi.sh.
+docker compose --env-file .env -f infra/docker-compose.erosi.yml exec -T db \
+	psql -U postgres -d postgres </dev/null \
+	-c "NOTIFY pgrst, 'reload schema';"
 REMOTE
 
 echo ""